Volvo 780 Front air tank keeps draining!

We have never had this problem with any of the other trucks that we have driven. We just bought a Volvo 780 and the front tank keeps draining while we are driving and has to be recharged about every 7 minutes. We are not braking or doing anything that would use air during that time and it does not do it when we are parked even if we have the airbrakes released on the tractor. At first I figured it was a brake chamber or airline that was leaking so while it was parked I walked all around with the airbrakes released and pressure in the system and no leaks. It only does this while we are rolling down the highway. The rear tank never shows a drop in pressure. There is no air leaking from the storage tanks. Any thoughts?

 

No, but Im thinking it might have something to do with the air bags on the drives or the cab. Something that’s only acive when driving. It’s maddening!

 

It’s a new truck. 2018 Volvo 780. Probably Should have mentioned that.

 

Im at the dealer. 2 leaks getting fixed. Air dryer and back of one of the tanks was cracked. Oh the trouble free joy of driving a new truck!