We have two bathroom on septic tank. In Bathroom A, the toilet bowl was full of water and would not release even with a plunger. At the same time, I heard bubbling sound from toilet in bathroom B. I flushed the toilet in Bathroom B and I heard Bathroom A toilet release. What's happening and how can I correct. I have used a snake in both, and the snake only seems to insert in side the hole opening about 6"-12". I am using a snake with a motor (forward/reverse. It doesn't seem to be helping. Help?