A1. The thermostat setting on the remote may be turned ON. This will turn the fireplace off after the room has reached a certain temperature. Turn the thermostat setting off on the remote and try again (refer to remote instructions).
A2. The fireplace may be going into lock-out. This is a safety feature built into the fireplace so that if it detects a fault or possible issue, it will turn itself off. Reset the unit via the isolation switch and try again.