Quick Answer

A Steam Deck that keeps crashing usually has one of three causes: an unstable Proton/game compatibility issue, a corrupted shader cache after an update, or an overheating APU under a too-aggressive TDP. Update SteamOS, clear the shader cache, and cap the TDP first - these fix the large majority of crashes without any hardware work. If only one game crashes, it is compatibility; if everything crashes, suspect storage or a failed update.

Update and clear cache first

Run the latest SteamOS - Valve ships frequent stability and Proton fixes. After any big update, a stale shader cache causes crashes and stutter, so clear it from Settings or by verifying the game's files. Verifying integrity through the game's properties also repairs corrupted downloads, a common crash cause on slower SA connections that drop mid-download.

Single-game vs system-wide crashes

If one specific title crashes, it is a Proton compatibility issue - check the game's known launch options and try forcing a different Proton version in its properties. If every game crashes or the Deck reboots, look at storage health and thermals instead. A nearly-full drive or an unstable microSD card can crash the whole system, so keep 10-15% free.

Thermals and storage

An over-aggressive manual TDP can overheat the APU and crash demanding games. Use the Quick Access menu to cap TDP and frame rate (40 FPS suits the 90Hz OLED) so the chip runs cooler and steadier. If you rely on a microSD card, a slow or failing card causes read errors and crashes - a quality 1TB UHS-I card (around R600-R1,200 at Evetech) is a reliable fix.

FAQ

Why does my Steam Deck keep crashing?

Usually an unstable Proton version, a corrupted shader cache after an update, or APU overheating. Update SteamOS, verify the game's files, and cap the TDP to fix the most common causes.

Does clearing the shader cache help crashes?

Yes - a stale shader cache after a SteamOS or game update commonly causes crashes and stutter. Clear it in Settings or verify the game's file integrity to rebuild it cleanly.

Can a microSD card cause crashes?

A slow or failing card can cause read errors that crash games or the system. Use a quality UHS-I 1TB card (around R600-R1,200 locally) and reseat it if you see repeated crashes from SD-stored games.

Update SteamOS, verify the crashing game's files, and cap the TDP in the Quick Access menu first - if a microSD-stored game still crashes, swap in a quality 1TB UHS-I card from Evetech.