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Another thing it could be, and again it can be a pretty simple fix is to check assuming you have a single faucet in shower or tub area is to remove the shower/tub handle and then remove the finish trim that surrounds the faucet itself. Quite often the foam gasket is missing or damaged that prevents water from leaking behind the trim and this allows water do drain behind the wall every time water gets onto the wall in that area. Just be sure when installing plumbers putty or caulk that you do not seal the bottom of the trim area. This will help allow water to leak out should some get behind the trim area.
Lastly, check the toilet wax ring. Push against the toilet with your knee, Can you rock the toilet? If so you need to remove it, find the reason for the toilet to rock, (uneven floor?) then replace the wax ring and reset the toilet to it does not move.