🚀 go-pugleaf

Your monitor must have a power source of the switching type. That kind
of sources has a protection scheme that, when the max current is
exceeded, the power goes down and don't raise anymore. Usually that
happens when the temperature is high or during temperature rising. 

I had a problem like that when I bought my PC clone. The solution
(made by the guys who sold it) was changing the POWER SUPPLY. In your
case you must find out if the power supply specs. are under nominal or
if there is some component in the monitor that has excessive power
comsumption


Hope this helps
 J. Augusto