I understand that you are having problems with a device as it keeps going in and out of the "Stand By" with the monitor.
Regarding this, I was double-checking what could be causing the problem and there are several things that we may be able to test to check and isolate the problem. First, please attempt to connect the monitor with a different cable, this is to discard a possible cable issue. Second, if possible, please attempt to connect the unit to a different monitor to check if the issue happens with both monitors.
Let us know the outcome of trying those two steps please.