I took the cover off, blew some compressed air into the switch and restarted - same problem.
I then thought that it may have been the power cord, so I changed that - same problem.
I then plugged into another electrical outlet (not via the P10) - problem solved.
I then tried another socket on the P10 - problem solved.
Not sure if it was the setup of the P10, but I have made sure all outlets are set to “switched” - wondering if it may be a dodgy outlet or I may have had that outlet set to something other than switched and when the PWT connected to the internet, it caused a restart?
I haven’t plugged anything into the suspect outlet to test it, I’m just happy it’s not restarting.