PC crashes once per day on starting up a game. Completely fine after.

The first time each day when I launch any game my PC:

Plays it for 2-5 minutes.

Starts stuttering until a full freeze.

Requires a restart.

Proceeds to work as normal for the remainder of the day.

I’m not really sure where to begin diagnosing and fixing this. I’ve searched and found loads of similar situations, typically people fault the RAM and/or the RAM slots on a motherboard?

Does anyone know the best tests to run that may lead to figuring out and solving this issue?

It’s a relatively nice PC from iBuyPower. A few years old but kept clean. Please lmk if specs would help at this point or to share any data from recommended tests.

Thanks in advance to any and all who lend a hand!