Trouble again!
The sink was backing up again this morning. Not nearly as bad as before, but holding maybe 2" in the bowl while the water was running.
Here is the weird part. I watched it slowly drain after shutting off the faucet. It drained until the water level in the drain was about level with the bottom of the sink. It stopped and held that level for a few seconds with no movement. Then, on its own, whoosh it drained. I did this twice in a row. Once the water is drained down to the P-trap, I then hear glug-glug-glug-glug-glug about 10 times or so. Is this maybe also a venting issue?
Do I need a plumber, or a witch doctor to remove the spell???????????