Thats just the point . It does not show cosistent symptoms / The monitor LED flashes differently , the MOSfet switches on randomly and sometimes stays on sometimes there is no activity at all , I have not done a full check in the field , it is rather difficult. Its 20 ft up the mast.I doubt that internal voltages would change , why would they
I'm looking for suggestions that might indicate what a different souce voltage might affect/change?
I'm going to try putting caps on either side of the voltage regulator in case its oscillating and interfering with the ATTiny85.