One thing that caught my attention recently is that the rebooting issue may be related to 5G network — check if your router is a 2.4G only or 2.4G/5G hybrid network. The WiFi chip is only compatible with 2.4G, and if it somehow got connected to 5G (likely because you have set the same SSID name for both), it could result in the rebooting problem. I personally use Netgear 2.4G/5G dual networks, and haven’t had any problem, but it’s not tested comprehensively on other 2.4G/5G hybrid routers so I can’t say for sure.
If the problem still persists, you can submit a support ticket and get it replaced.