Blown propane pressure valve

[redyakker64]

We have a 2019 Winnebago Vista. Last year during a 5 hR drive with temps in he low 100, we blew the pressure relief valve on the underbelly propane tank. Our extended warranty paid for the repair and replacement of the blown valve. Today , while returning from a 4.5 hR trip, with temps of 103, the same thing has happened again.
Had anyone experienced this ?
Any advice is greatly welcomed !