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That issue is caused by a sticking check valve in the air tanks on the secondary side. The aggravating part is in order to resolve it, the tank needs to be replaced because the valve is internal on the tanks. Thee is no external valve that controls that.
The tank needed is the wet/secondary tank. It has the check valve that is supposed to have equal pressure build between the tanks. Sometimes you can run air line cleaner or air line alcohol through the system to get debris out that would cause the tanks to do that, but in all the times I have had that issue, I have had maybe 1 out of 5 clear up that way. I had to replace more than not.
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