Every day when I have a shower, the drain starts out plugged. The water from my shower will slowly fill the tub. After about a minute or 2 the drain will unblock itself and the water will all drain out normally. The tub will stay unblocked for the rest of the shower, but will return for my next shower. This has happened for every shower that I've had for the past month or so.
Why is this happening? Is something wrong with the plumbing?