Had same issue. Tank was full, noticed the leak at a rest stop, had to continue driving to dissipate the gas, half full when it stopped leaking. Took several calls to Jayco to persuade them to replace the valve. Dealer would not replace, had to be done by pros who can capture the escaping propane when the valve is removed. Seems ok now.
2011 Jayco Greyhawk 31DS with wife & 2 dogs
06 Jeep Grand Cherokee LTD