Also, have had to repair 3 different water shoes from 2 different companies. The sole was coming loose in each case.

Repaired a newer pair of teva sandals myself by completely removing the sole, and cleaning the surface before applying adhesive. Used a lot of duct tape and placed a heavy weight on top until dry. They are holding up so far, but it may be worth having your shoes profesionally re-soled if you have a problem.