Silent Scone wrote:
Spontaneous rebooting is often indicative of defective or failing power supplies. It's also the same for memory or cache instability, so revert the system to stock including no XMP profile and see if the issue persists. The fact it's started since updating may well be a red herring.
Mine did the same while using a single power cable, with splitter, to the GPU. Using two separate power cables to the GPU fixed my problem. May help, may not but worth mentioning.