Hi, I've recently bought and built a new pc (Ryzen 5 2600, GTX 1660 SUPER, 16Gb of ram) and since I've owned only a pre-build, I don't have that many experiences with all of this.
Everything seemed to go fine: installed Windows, Geforce Experience, Steam etc. but when I got to play the first game (Doom 2016), it started crashing in around 20-minute intervals. I thought it could be some outdated drivers, so I reinstalled them manually in the Geforce Experience, but the crashing persisted until I wasn't even able to get to the main menu. I found out that it could actually be a problem with the game because some people had the same issue and after a few failed attempts on fixing it, I gave up on Doom and tried another game, Battlefield 1.
Guess what! Battlefield keeps crashing as well. I've downloaded some monitoring software (NZXT CAM and MSI Afterburner) to find if the issue was in the hardware but found nothing weird. I played both games on ultra and had more than 100fps, so I don't think my pc wouldn't handle it.
The last thing I could think of are the temparatuers. I have a pretty budget but nice looking case (Cooler Master MasterBox Q300L) which has relatively good reviews and the only thing that reviewers complain about is the single case fan in combination with the choked intake. Though I've heard nobody complaining the bad airflow made their CPU throttle.
I'm currently looking at the monitoring software both CPU and GPU are sitting at 50°C, so this might be the problem...
Btw sorry for my crappy English and thanks for any help!