Volvo Val 760 2019 air system issue

Maybe somebody can help me out.
I ve got new Volvo vnl 760 2019 model. Drove for 11 months ,we are team drive so we put 210000 miles on it.suddenly compressor started pumps every 20 second, so I checked for air leaks,there is no air leaks, I took to a dealer ship spent a day up there ,they said there is a problem with the trailer ,my trailer is 1 month old brand new, and I still took to mechanic and there is no problem with it. So I decided to take to another dealership,same thing they check with computer no codes,mistakes nothing.in the end they changed AlR GOVERNER,AIR DRYER,AND AIRCOMPRESSOR.And nothing changed .compressor still pumps every 10-20 seconds sometimes drop 1 psi and started pumping.one thing what I realized when temperature is cold and raining it starts working better,sometimes with no issues.At this moment I have no idea what to do,because nobody knows what’s up,and dealerships can not give unswer

 

Thank you for reply
The fan stays on all the time,speeding up only when going up hill with heavy load.
Will take it to mechanic and will tell him exactly what you said to see if they can fix it

 

And it’s only happened while I am driving
When I am parked with engine off ,everything is working great

 

And it’s only happened while I am driving
When I am parked with engine on ,everything is working great

 

I was wrong about fan
I checked it
It’s not on all the time,it turns and turn off
And I have change Air dryer,air compressor and air governer all brand new

 

That’s honestly I do not know if they did as everything was doing by dealership by warranty