But that is one of the usual shop hounds. Sometimes you can fix it with a good cleaning and fresh heatsink along with updates to BIOS and more but after you do all that you start putting in a new PSU (make it bigger and single rail) then motherboard, CPU and RAM.
The build is sadly one I've seen for years and cringe as I think about how often it takes a lot to fix it.
So, start with the cheap work and DO NOT FALL for temp measurements. Just do the heatsink and compound works, BIOS and be sure the BIOS is in defaults or it's safest settings.
hi, this is kind of a last resort as my friend has almost given up, pretty much during gaming sessions her pc randomly crashes ( screen freezes and then we have to reboot it via restart button ) very rarely it bluescreens sometimes aswell. ( only when she is gaming ) we just cant identify the problem, it got built about a year ago at a pc shop ( we bought the parts they fitted them ) all new parts apart from the SSD/HDD both got wiped, its very random as to when it happens, could be after 30 minutes/sometimes 3 hours, its not a temperature issue as everything stays very cool . under 40c , we just cant work out why this keeps happening, all drivers are up to date tried googleing the problem but nothing has seemed to work, hoping someone here might now the cause of the problem ! the GPU is a R9 380 , the motherboard is a MSI 970 gaming and the CPU is an AMD FX 8350 and it has been happening pretty much since it got built.