Help. We moved into our house this past Feb, however over the past month or so a gas type septic odor comes from the master bathroom, mainly the toilet. The odor varies in strenght, from mild and last for a little while, to very strong and lasting for hours. The odor is also on occasion in the back yard. We live in the desert where it gets very hot, does this have anything to do with our problem? Can anyone help us figure out how to take the stink out of or house?