A few weeks ago while manually vacuuming I would get to a certain area in the shallow end and the vacuum head would get stuck to the liner. It has happened every time I manually vac. I was in the pool yesterday and walked over the area and noticed it had a mushy feel as if water is under the liner in that area. My liner is old, showing signs of wear and I have a small leak somewhere. I have to add an inch or two of water every other day. Is this for immediate concern? Could my liner float?