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The original was posted on /r/steamdeck by /u/sans_the_comicc on 2024-02-08 22:42:48.

look, i love valve as much as any other person around. they always pushed the industry forward, and i also consider steam deck to be the best gaming device made at present moment. but 3.5 steamos update release is... awful.

lately i've noticed my deck crash randomly in some games. some worked fine, but some crashed randomly. it could be 5 minutes or 30 minutes, just randomly. there was no symptoms that could backtrace the crash to anything. i even reset my deck to factory settings and it didnt help.

but when researching the dark depths of google, i found some posts dating to autumn 2023, and very particular github thread about this issue. apparently, on some deck revisions, the clock can jump 200 and 1000 mhz quickly, even if the temperature of gpu is okay and it's not throttling, and this issue is somehow tied with crashes. crashes appear pretty often and make deck not very playable long term.

to this day, this is not fixed. most recent stable release, 3.5.7, is crashing on these revisions, and even official beta 3.5.11 is... crashing too, surprisingly!

so, if you encounter this issue, kid, i have two ways to fix it for you.

1. apparently, for some people setting their vram to 4 gb works. you can try this, its as simple as changing a value in bios. here's a good guide. doesn't work for everyone though, for some people crashes persist
2. update to unstable alpha of 3.6 versions.

enable developer mode in settings. go to developer settings at very botton. enable advanced update channels. set channel to stable in system settings and update.

steamos developers advice against it as it's not ready yet, but at least they fixed 200/1000 bug here, which allows you to play games without deck hard rebooting itself every 15-30 mins.

valve still got huge reputation credit and their support was always helpful, but leaving crashing version on stable for 4+ months... man...

anyways, hope it helps anyone. cheers!