A couple of weeks ago the ceiling over our kitchen table started leaking and water was dripping onto the table. Stain is about a foot in diameter. Turns out that the toilet for the hallway bathroom had overflowed and the water went under the toilet, which is direct over the kitchen table. The dripping lasted a couple of hours and then dried up. The stain has dried and I planned on fixing it later since I thought that was the end of it. However, last night the dripping started again, even though nobody had been using the toilet. The dripping (12 hours later) has basically stopped. The water stain is a little bit bigger now. I now wonder if it is a leaky pipe. Our master bath is adjacent to the hallway bath and it gets the majority of usage. What puzzles me is the fact that there was no problem for a 2 weeks, but now it's back. I have never had to fix anything like this. What should I do first?