We had the exact same thing happen in our 2017 Cyclone last summer while workamping. Thank heavens Gary is Mr. Fix It and made the repairs himself and now our sink will never again fall out!
IMO it is a losing battle to expect good QC on RV's. We had several minor issues with our brand new cyclone....faulty GFI so no electrical outlets worked, fireplace not wired.
The low pressure regulator valve in one of our propane tanks had to be replaced by Heartland along with an Anderson Valve Repair kit for the water selector valve. Heartland was very responsive to both these needs as we were getting ready to leave our winter headquarters and hit the road for the summer.
We had two Big Horns before our Cyclone and also had issues with them. We did not let this damper our spirits with Heartland. We are fulltimers in our Cyclone and we have lived in it now for just over a year and we are very happy with it in general.
Don't be surprised if other minor items crop up over time.
Susan & Gary
Well, actually if I wasn't "handy" and able to do 99% of the repairs myself (I refused to re-weld the mis-aligned frame brackets for the bike rack), my coach would be at the dealer more than on the road. All relatively minor stuff (to me) but still indicative of a lack of QC. Just the other day, I installed an RVLock on the driver side slam hatch. Easy job you say? Wrong - someone at the factory cut the latch hole sloppily, resulting in a tiny gap in the upper left corner. Not a big deal - a little dab of silicone did the trick. It was either that or a new slam hatch door - I suppose I could have gone to Heartland for a new door, but they would say it was the atermarket part even though the hole was cut poorly.
Point is, RV "quality" is a relative term. In my opinion, Heartland coaches are better than most mass produced coaches but overall quality still leaves much to be desired - just look at the complaints on this forum. Your sitting in your coach and the sink just falls out? Really? The best part is that others had the same thing happen, so it's not a rarity.
The RV industry will learn the exact same lesson Detroit did in the '70's as soon as the Japanese or Koreans figure out how to build these things and ship them over on a boat at a competitive price. One indicator that quality is not an issue with manufacturers is that fact that, with all of the various sub-forums on this forum, not one addresses "Quality".
Might be helpful to Heartland and the owners if there was one. Just 'sayin.