Just re-caulked the tub, not the tile. The plumber let the water running for over 5 minutes through the bath sprout, no leak. When I start taking shower (approx. 2 minutes), water leaks from the bottom of the tub onto the floor, close to the drain. The shower curtain is in good condition. Tried to put water in a bucket and took the shower, no leak. I have a large tub, tried to stand away from the drain and take light shower(minimum water and hold on to shower arm all the time), no leak. Weird... The plumber first said it was the caulking, now he thinks it is the tile... the tile... Please help.