[SOLVED] PC randomly shutting down

[PrG]

My rig turns off without a warning, but all the ports on the motherboard and the front panel work fine (stays on) after this happens. System fans, cpu fan, motherboard, rgb and gpu turns off. This is happening from 4-5 days even when im not doing any heavy tasks or playing games. The temperatures always stays under 90 C. Is this PSU related issue or motherboard fault or something else?
My rig:
AMD Ryzen 2600 with Stock Cooler Fan
RTX 2060
MSI b450 Tomahawk with the latest BIOS
Corsair Vengence 16 GB (8GB+8GB) 3000MHz
PSU: Antec 750w

 

[Ralston18]

Look in Reliability History for error codes and warnings that correspond with the turn-off's.

Power down, unplug, open the case.

Clean out dust and debris.

Then check that all cards, cable connectors, RAM, and jumpers are fully and firmly in place. Do so visually and by touch.

Determine if anything has worked loose over time.