It might be the circuit protection kicking in - I have exactly the same issue.
To reset the "breaker" you have to kill power to the PSU then it will start up again.
Do you know what caused the power loss? Or are they just cutting out?
If they are just cutting out then it is overload.
oh no it was me switching configurations around, it may not be an issue with an actual power loss due to longer length
jw if anyone had a cleaver way of fixing this cheap