I have not had that issue, but, I do think when the first one snapped and the dealer replaced it, they would have hopefully done a little analysis on why it snapped. They obviously did not. This, IMO, should have been caught at that time. Whether the slide is adjusted improperly, the attachment plates are aligned incorrectly, I don't know but your dealer is the owner of this situation IMO. Keystone hopefully will cover it because it's obvious, to me, that continued use with the cables crimped like that will just lead to other failures. I wish you luck - and I surely wouldn't go lightly on the dealer.
Danny & Susan wife of 53 years
2019 Ram 3500 Laramie CC SB 6.4 4x4 4.10
2020 Montana High Country 331RL