In the last week or so, we've had our toilets and sinks "gurgling" when our clothes washer is draining. No other time do we get this gurgling.
My first guess is a bad vent on one of the drain pipes. I haven't replaced any yet.
Our kitchen sink doesn't gurgle during this and it's "upstream" from the clothes washer which reinforces my bad vent guess, I think.
Hopefully its not a septic problem - we had it pumped 2 years ago. It's one of the fancy aerator-types and no alarms have gone off so I doubt it's a full tank.
Any other ideas before I start throwing new vents on? (It'll be a PITA in a crawlspace)