Hi,
Ints M wrote,

> Hello,
> I've tried both local and ssh. Wireless is configured in menuconfig, it's WPA2.

Finally fixed. Rpi Kernel upstream renamed a watchdog related symbol
and I did not see it.
git pull for the fix. make menuconfig and exit to refresh your
.config. It should contain BCM2835_WDT symbol afterwards.
make and recreate your sd card should be enough.

Confirm if it fixes your reboot issue.

best regards
Waldemar