Okay, when I take a bath and let the water out of the tub, my toilet bubbles and then the water empties. Yesterday, the same thing happened, but the water did not empty from the toilet and the water in the tub was not draining. I checked the opposite side of the house and the other bathroom would not flush either without over filling. So I plunged until it would finally drain. Today everything seems to be working fine, but I believe I still have a problem. Any suggestions?