Hi, no BSOD code. No resource-heavy apps runs with sandstorm (except Vivaldi Brovser with about 50 tabs, but it still doesent go over RAM capacity). Sandstorm is unfortunately only app(or game) that causing death. MB error is possible, tho I dont know how to validate it.
Powersupply is big question. Theoretically, its a bit understrength (400W with some better effectivity rating, I thing its platinum or sth like that)...with 6c12t Ryzen and Rx480 on it... But measured max constumption of whole system never even spiked over 260W during long-term load - It ussualy keeps at 160-220W.
I've run RAM test recently, as well as SSD check, no error has been found.
Display drivers have been updated twice in last... 6 months? during which this error troubles me. Ill try to do clean instal of these.
Ad temperatures: no, i do not monitor temps on daily basis, tho i have set alarms at BIOS manually and i have been monitoring temperatures during short-term and long-term heavy loads last summer, which validated cooling system. That said, I do clean dust of it on regular basis.
I have checked Windows Event Viewer, there is lots of entries, but non mentioning power/surge.
In the house I live, there are rather old electical wires, one phase seemd to drop randomly every few weeks for few miliseconds... tho this should not affect PC as it is UPS-backed up now.