R_1 :
My canned random reboot Rant
Random reboots are usually caused by the PSU, the RAM or software AND in that order of likely-hood.
PSU - If you can borrow/swap a PSU for testing. sibling/friend you can swap out the PSU and each system will be testing the other.
RAM - run the system with one stick of RAM see if stability returns if not Test all the RAM with memtest 86 for three passes or overnight. if you get no 0 errors after more than three passes the ram is good. with the random reboots I would suggest running this test after the PSU swap or after the PSU has been cleared.
Software - Drivers or other issues can cause reboots. Boot to a linux distro on a USB drive. mint linux will boot to memtest86. you can run the OS from the USB and await reboot.
end canned rant
I just realised that i haven't cleaned it for almost a year... and the PSU takes air in from a vent in the bottom, no filter. ill try that as well as running that RAM program.
the restart thing usually happens everyday, i found it to be every 19 hours when the computer is on. i do random tasts as well, meaning something is triggering a restart. I also tried changing a settings in advanced system settings about start up and recovery, when the computer runs into an error or system fail it WAS selected automatically restart. I just unchecked it last night, so that might give me a different outcome to.
I also went to device manager, no updates needed. and drive booster 5 said i needed audio updates.