About a week ago my toilet started gurgling while I was in the shower. That night it overflowed twice and then when it stopped, all the water in the bowl disapeared. Then it started acting normal for a few hours. The next day it started acting back up.
If I am taking a shower, the toilet gurgles and fills with water. It doesn't stop and will overflow, unless I shut off the shower or the water to the toilet. If the washer or dishwasher is running and you flush the toilet the bowl doesn't flush, it fills with water to the top of the bowl.