All right. Other options:
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Have you updated your BiOS? There is a known issue with Ryzen CPUs and an old BiOS version causing crashes.
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Do you have any overclocks that you can disable temporarily? This applies to CPU, GPU, and RAM.
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Have you checked for background applications that could be causing conflicts?
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Have you checked for overheating? Since you said you could play for a while before crashing, this could be related. You can use an app like HWMonitor to check for temperature spikes (not averages like most displays in-game on in Windows system tray use).