Hi, My XT8s are experiencing the same issue on 386.5_2-gnuton0. The reboot is only happening on the main node. The AiMesh node retains its wifi connections when the main node reboots. Tried to access the webui while the reboot was taking place, which resulted in an error page stating to check the power on the main unit.
After switching back to 9.0.0.4.386_46980-g589e200-test only on the main node, the reboots stopped and everything went back to normal. The AiMesh node is still on 386.5_2-gnuton0 without any problems. I ran this config for four days without any problems.
I switched back to 386.5_2-gnuton0 on the main node and within 10 minutes, the main node started rebooting. Tried both clean and dirty upgrades with the same result.