We have a 2012 Fleetwood expedition with a rear bathroom. This afternoon we noticed the wall on the left side was pulling away from the floor and the cabinets in the rear bathroom, opening about a 1/4 inch gap between the wall and the floor behind the toilet. This was during the hottest part of the day with the sun beating down on that part of the motorhome. Later on this evening, after the sun had set, we noticed the wall had returned to its original position. This was only noticeable on the inside of the motorhome, the outside appears fine and we haven't noticed any leaks. Has anyone else noticed anything similar? This is certainly the first time we've noticed this happening. Should I be worried about this? Harv and Jeannette