I have a guess.
It is maybe due to the heat inside the box that disturb something.
At 12:00 today the exhaust indicate 35.6° aand the ambient temp was 30°
At 08:30 the ambient temp was escalating from 30 to 34°that mean at that time the exhaust air from the board might have be 40°
I decide to move the A3 to a new location from screwed to the inside part of the wooden shutter to a cool wall.
Will see
