hi,
check at the back of your equipment to see if theres 1) a forward path attenuator 2) a cable simulator or 3) an equalizer coloured purple/green/or orange in that order,if there is remove them in the heat (this will enhance the signal level) but remember to replace them in normal weather.the amplifier in the cabinet is heating up to such a degree that the signal levels are dropping,hence your online/rdy lights are flashing.