Why does my game freeze?

Because something is blocking the game from responding, usually the main thread blocked by heavy work, a deadlock, or an infinite loop, the game isn't crashing, it's stuck doing (or waiting on) something. A freeze (hang) is different from a crash: the game doesn't terminate, it stops responding, becoming unresponsive to input and not updating, because something is preventing it from continuing its normal loop. The common causes: main thread blocked (games run input, update, and rendering on a main thread, and if you do heavy work on it, a big computation, synchronous I/O like loading a file or a network call, processing a large amount of data, the main thread can't service the game loop, so the game freezes until it finishes, or indefinitely if it's slow enough), a deadlock (two or more threads each waiting on a resource the other holds, so neither proceeds and the game hangs), an infinite loop (code that loops without terminating, locking up the thread), or waiting on something that never completes (a network request with no timeout, a resource that never loads). On mobile, a frozen main thread triggers an ANR (Application Not Responding). The key is that a freeze is a blocking problem, something is occupying or stalling the thread that should be running the game. To find it, capture what the game was doing when it froze (the operation, state, breadcrumbs). So your game freezes because something blocks it from responding, typically heavy work on the main thread, a deadlock, or an infinite loop. Bugnet captures the context and breadcrumbs around freezes, so you can see what the game was doing when it hung (the blocking operation or state), revealing what to fix, move the heavy work off the main thread, resolve the deadlock, fix the loop, so you can address the specific block causing the freeze and verify per version it stopped.

How do I fix a game that hangs or freezes?

Find what's blocking the game (from captured context), then resolve it, move heavy work off the main thread, fix the deadlock, or terminate the infinite loop, and verify the freeze stops. Fixing a freeze means identifying and removing the block. First, find what's blocking: capture the freeze with context (what the game was doing, the breadcrumbs, the state when it hung), which points at the blocking operation or condition. Common findings: a heavy operation on the main thread (a load, a computation, I/O, a network call running synchronously on the thread that handles the game loop), a deadlock (threads waiting on each other), or an infinite/long loop. Second, resolve the block based on the cause: for a blocked main thread (the most common), move the heavy work off it, do loading, computation, I/O, and network calls asynchronously or on background threads, so the main thread stays responsive (and show a loading indicator if needed), for a deadlock, fix the locking order or synchronization so threads don't wait on each other circularly, for an infinite loop, fix the loop's termination condition, for waiting-on-something, add timeouts and handle the wait asynchronously. Third, verify per version that the freeze stopped, since freezes often depend on device performance or data, confirm it's gone in the field, not just on your machine. The main-thread-blocking case is by far the most common in games, so if the freeze happens during loading, processing, or a network operation, suspect main-thread work and move it off. So you fix a hanging or freezing game by finding the block (captured context), resolving it (move work off the main thread, fix the deadlock or loop), and verifying. Bugnet captures the context around freezes (what the game was doing), so you can locate the blocking operation and fix it, then confirm per version the freeze is resolved in the field, turning an opaque hang into a diagnosed and fixed block.

What's the difference between a crash and a freeze?

A crash terminates the game (it closes/exits), while a freeze hangs it (it stays open but stops responding), they're different failure modes with different causes, but both stop the player and both warrant fixing. A crash is when the game encounters a fatal error (an unhandled exception, a memory violation, an out-of-memory condition) and terminates, the game closes or exits, often with an error or just disappearing. A freeze (hang) is when the game stops responding but doesn't terminate, it stays open, but becomes unresponsive to input and stops updating, because something is blocking it (a blocked main thread, a deadlock, an infinite loop). The causes differ: crashes come from fatal errors (bad memory access, unhandled exceptions, running out of memory), while freezes come from blocking (work stalling the main thread, deadlocks, non-terminating loops), nothing fatal happened, the game is just stuck. The player experience also differs slightly: a crash abruptly ends the session (and may lose unsaved progress), while a freeze leaves the game hung (the player waits, then usually force-quits, also losing progress). On mobile, a sustained freeze can trigger the OS to kill the app (an ANR on Android), turning a freeze into a termination. For diagnosis, crashes typically produce a stack trace at the point of the fatal error, while freezes require capturing what the game was doing when it hung (the blocking operation), since there's no fatal-error stack trace, you're looking for the block. Both stop the player and hurt the experience, so both warrant capturing and fixing. So the difference is that a crash terminates the game (from a fatal error) while a freeze hangs it (from a block), different failure modes and causes, but both disrupt play and need fixing. Bugnet captures both crashes (with stack traces pointing at the fatal error) and the context around freezes (revealing the block), so you can diagnose and fix each appropriately, the crash by its stack trace and cause, the freeze by what was blocking it, addressing both failure modes that stop your players.

What to Do When Your Game Freezes

Quick answer: Capture the freeze with context (breadcrumbs and what the game was doing) to find what's blocking it (main thread blocked, deadlock, or infinite loop), fix by moving work off the main thread or resolving the block, and verify per version.

A freeze, where the game hangs unresponsively instead of crashing, is as frustrating as a crash and sometimes harder to diagnose. Finding what's blocking the game is the key. Here is what to do when your game freezes.

Capture What the Game Was Doing When It Froze

A freeze means something is blocking the game from responding, and you need to find what. Capture the freeze with context, the breadcrumbs and what the game was doing when it hung, so you can see what operation or state preceded the freeze, pointing at what's blocking the main thread or looping.

Bugnet captures context and breadcrumbs with issues, so you can see what the game was doing when it froze, the operation, the state, the sequence. That reveals what's blocking, a heavy operation on the main thread, a state that deadlocks, a loop that doesn't terminate, turning an opaque hang into a diagnosable cause you can locate and fix.

Identify and Fix What's Blocking

Find the block: freezes usually come from the main thread being blocked (heavy work, I/O, or a long computation running on the thread that handles input and rendering), a deadlock (two things waiting on each other), or an infinite loop. Fix by moving heavy work off the main thread, resolving the deadlock, or fixing the loop.

Bugnet's captured context points at what was happening when the freeze occurred, helping you locate the blocking operation. Knowing what the game was doing (a load, a computation, a network call on the main thread) tells you what to move off the main thread or fix, so you can resolve the block causing the freeze rather than guessing where the hang is.

Verify the Freeze Is Resolved

Verify per version that freezes stopped, the hangs no longer occurring on the fixed build. Since freezes (like crashes) drive players away and are often underreported, confirming in the field that the freeze is gone, not just that it works on your machine, is important.

Bugnet tracks issues per version, so after fixing you can confirm the freeze stopped on the new build in the field. This verifies the fix worked under real conditions (the freeze gone where players hit it), rather than assuming, since freezes often depend on device performance or data that your machine may not reproduce, field verification confirms it's actually resolved.

When your game freezes, capture what it was doing when it hung to find the block (usually heavy work on the main thread, a deadlock, or a loop), fix by moving work off the main thread or resolving the block, and verify per version. A freeze is a blocking problem.