Monoprice i3 clone heat shuts off printing abs
this could be connected to a thermal shutdown protection.
Most firmwares requires a decent increase in temperature every few seconds.

if you use Marlin then in the source code you can extend thermal shutdown timings.

what to check:
check every single connector to eliminate any fiddling or play - risk of fire !!!

if any of wires goes hot - double check connections, replace wires/connectors


note temperature change (how many seconds/degree) on the hotbead
then increase voltage on psu (probably you have a led psu - so there is a small regulator next to the connectors)
validate if that help