It's a venting problem. We had the same thing when our rig was new, the vent pipe was extending too far into the black tank, but I'd have thought the previous owner would have addressed that. I've also heard of others having the issue after the black tank had been "overfilled", allowing TP to get stuck in the bottom of the vent pipe.
You can also check to make sure nothing is blocking or covering up the vent pipe where it exits the roof.
Good luck.
__________________
Jay and Peggy Monroe
"Can't take it with you, not leaving any behind"
2024 Jayco White Hawk 26FK
2024 Ford Expedition
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