Question new build keeps freezing then crashing or has to be restarted

Apr 8, 2020
AMD Ryzen 7 2700X 3.7 GHz 8-Core Processor
Asus ROG RYUO 240 RGB 80.95 CFM Liquid CPU Cooler
Asus TUF B450M-PLUS GAMING Micro ATX AM4 Motherboard
G.Skill Ripjaws V Series 32 GB (4 x 8 GB) DDR4-3200 Memory
Crucial P1 1 TB M.2-2280 NVME Solid State Drive
MSI Radeon RX 5700 XT 8 GB Video Card
be quiet! Pure Power 11 CM 600 W 80+ Gold Certified

i bought this build as a gift for me brother before 9 months ago and i been trying to get it to work for that long but no luck. we did leave it from time to time because we gave up. but now we have time because of the Covid-19 pandemic and we want to finally fix it so my brother can enjoy some GTA 5.

we had two Mainboards the Asus Tuf and B450 Tomahawk.

the B450 Tomahawk kept crashing and giving us a new blue screen every time. we tried everything, but got no where. we changed to the fut Mainbaord. and its better. it doesn't crash that much. and weirdly only when it is idle like very light use. surfing or downloading things or just not doing anything. so it will freeze then it will either restart or just stay frozen until we shut it down ourselfs. i updated the bios and all the drivers. but still random freezes maybe two times a day. some days every one hours. it is very confusing. and i hate seeing so much spent on a crap rip. if you can help me please do. i can use any advice given. thanks in advance
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