I've fought this battle before and I am not finding a question that matches mine exactly. A little over a month ago, the toilet started acting funny. Not flushing every time, the solids would go down but the paper would just swirl at the top. Eventually the water would drain back out of the tank. Shortly there after (with in days) every time we turn either the shower or the faucet in the kitchen on the toilet makes the blop blop blop noise and bubbles. Now the toilet won't flush at all now, the bucket trick doesn't even work. We go to flush it the bowl just fills up and doesn't drain, if it does it does so very very slowly. Solids aren't even going down. Something similar to this happened last spring, but the septic actually backed up in to the toilet. I had it pumped and the lines cleared. With in two months though the septic tank was full of water again and the toilet was acting the same way and needed to be pumped again. I talked with the septic guy and he said the tank look good and was in good shape, but that it was such a wet spring are our water table is very high that it wasn't letting the leech field do it thing. Everyone in my area was experiencing the same thing. So I didn't worry too much about it. The summer passed and everything was working back to normal. Now that its winter time, its not working again. I am at a loss. The tank shouldn't have to be pumped again, that was only six months ago and there's only two of us living there. There's no standing water anywhere in the yard. It does feel like there's water in the lines leading from the basement to outside the house. Plus, its not wet anymore, in fact everything is frozen. Something I've noticed in the last two days is that the snow directly on the line coming from the house to the tank is melted and no where else in the yard. It is an older system, put in in the 1960's I believe. I don't even know where to start. I'll be honest, I am tired of having to run to the park every time I have to go to the bathroom. Any help, anything to try I am all ears. Thanks

Well, we don't have a septic tank, because we live in town. But good to know that even people with septic tanks tend to experience the same thing we are. We do have bla bla coming up from either the toilet or sink when we use the washer. Then after a year that we lived in the house. Our toilet started to act up like yours. Everything else would flush, but then it stopped flushing period. We used the snake, but that didn't help. So we tried pouring a bucket of water down to make whatever stuck, unstuck. That didn't work. So we had to get a plumber out here to see what was up. But my husband had open the outside main water drain. He stuck the snake through there, and it pulls out a thin, white, hard things. Which came to be roots growing in our watermain pipe. So the plumber came out and he had to use their big snake to make to go through there all the way through to the toilet. To clean out all the roots that grew in the watermain pipes. B/c we do have a lot of trees in our yard. So that was really helpful. The plumber was very helpful, saying you can buy that stuff at Lowe's, for root killer to help from them growing in our watermain pipes. Then over a year later the same thing was starting to happen with the toilet again. We bought that stuff that the plumber was talking about and boy it work right away. I just don't know exactly if you have trees around your septic and if can use chemicals in your septic to kill whatever maybe trying to grow in your watermain pipe or lines. Hope this may give you some insight. Good luck.

Sounds like your drain vent is plugged up.
=D

From the page over at DoItYourself.com:

Your drain vent is the channel through which sewage and gray waters are discharged from your house. This vent may experience frequent build-up of debris. A clogged drain vent creates problems in the drainage system as water will not be discharged out of the bathroom as it should. It is best to clean your drain vents twice a year to avoid drainage and plumbing problems. Fortunately, it just takes a bit of time and a few basic items.

Read more: Cleaning a Drain Vent | DoItYourself.com

I disagree with Keyz. And the only "drain vent " is called a wet vent in my world.
This is NOT a vent problem. The blockage is downstream from the toilet in THE DRAIN LINE. This has nothing to do with the vent system. Remember this. Bubbles= a drain line clog while gurgles= a vent blockage. And I don't care what the DoItYourselof site says, Tom

I Was sharing what worked for me. Try decaff.