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 is not crashing, it is stuck. A freeze (hang) differs from a crash: the game does not terminate, it stops responding because something prevents it from continuing. Common causes: main thread blocked (games run input, update, and rendering on a main thread, and if you do heavy work on it, computation, synchronous I/O, processing, the main thread cannot service the game loop, so the game freezes), a deadlock (threads each waiting on a resource the other holds, so neither proceeds), an infinite loop (code looping without terminating), or waiting on something that never completes. On mobile, a frozen main thread triggers an ANR. 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 and verify per version it stopped.

How do I fix a game that hangs or freezes?

Find what is 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. Find what is blocking by capturing 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 (the most common, move loading, computation, I/O, and network calls off it to keep the main thread responsive), a deadlock (fix the locking order or synchronization), or an infinite loop (fix the termination condition). Verify per version that the freeze stopped, confirming in the field since freezes often depend on device performance or data. 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 from a fatal error), while a freeze hangs it (it stays open but stops responding from a block), different failure modes with different causes, but both stop the player. A crash is when the game hits a fatal error (an unhandled exception, a memory violation, an out-of-memory condition) and terminates. A freeze (hang) is when the game stops responding but does not terminate, it stays open but becomes unresponsive because something is blocking it (a blocked main thread, a deadlock, an infinite loop), nothing fatal happened, the game is just stuck. The causes differ: crashes from fatal errors, freezes from blocking. For diagnosis, crashes typically produce a stack trace at the fatal error, while freezes require capturing what the game was doing when it hung. Both stop the player and warrant fixing. Bugnet captures both crashes (with stack traces) and the context around freezes (revealing the block), so you can diagnose and fix each appropriately, the crash by its stack trace, the freeze by what was blocking it.

Ways to Prevent Game Freezes

Quick answer: Move heavy work off the main thread so it stays responsive, avoid deadlocks, fix non-terminating loops, and capture freezes with context to find what is blocking, a freeze is a blocking problem.

A freeze, where the game hangs unresponsively instead of crashing, is as frustrating as a crash. Here are the best ways to prevent game freezes.

Move Heavy Work Off the Main Thread

Prevent freezes by moving heavy work off the main thread, do loading, computation, I/O, and network calls asynchronously or on background threads, so the main thread stays responsive. A blocked main thread is the most common freeze cause.

Bugnet captures the freezes and ANRs from main-thread blocking (with context showing what the game was doing), so you can see when heavy work is blocking the main thread and move it off, then verify the freezes stopped.

Avoid Deadlocks

Prevent freezes by avoiding deadlocks, where two or more threads each wait on a resource the other holds, so neither proceeds and the game hangs. Careful locking order and synchronization prevent deadlocks.

Bugnet captures the freezes from deadlocks (with context showing the game stuck), so you can identify when threads are deadlocking and fix the locking, then verify the freeze stopped.

Fix Non-Terminating Loops

Prevent freezes by fixing non-terminating loops, code that loops without terminating locks up the thread and hangs the game. Ensure loops have correct termination conditions so they cannot run forever.

Bugnet captures the freezes from infinite loops (with context), so you can see when a loop is hanging the game and fix its termination, then verify the freeze stopped.

Prevent game freezes by moving heavy work off the main thread, avoiding deadlocks, fixing non-terminating loops, and capturing freezes with context to find what is blocking. A freeze is a blocking problem.