There are a ton of issues that have been dealt with on all the different brands, seems to be way to common with Monaco leading the pack for several years
I think that I have about the same set up as yours on my Ultimate Advantage, and have had the same problem, except on mine it always pulls away at the swivel connection elbow where it goes from the slide into the cabinet. What it did last time that it pulled loose. I replaced that section of the ABS pipe and elbow with an 1 1/2 inch rubber elbow and hose coupler. My thought process on this was to make that part that bends a little less ridged. Not sure that's the answer, but we will see.
Other solutions out there if you do an internet search
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