@Noel I've tried with empty Community folder but, as it is a very random issue, I may fly 4/5 flawless flights and then the issue appears. Considering that the "vanilla" MSFS is absolutely boring with no sophisticated scenery, aircrafts or AI traffic, it becomes very boring to fly without addons.
As for CPU/GPU temps, they seem quite regular. I've already emptied DX and Nvidia cache and already deleted rolling cache. @Noell I'm on Store version, so don't know if a repair tool exists as for Steam. @rickjake I'm running FSUPC but without autosave. I'll try what you suggested and report back.