I recently had a full bathroom installed in my basement. The toilet will act like it is clogged and not empty when flushed (even with flushed with no solids), but then flush fine after waiting some time (10 minutes), then it will act clogged again (even with no solids added), flush fine, repeat. This makes me think there is a partial clog, but I found nothing using a toilet auger. At the same time, the sink and shower ALWAYS gurgle when the toilet is flushed, which sounds like a blocked vent. My questions are: could a clog in the toilet waste line cause the vent to be blocked (i.e. should I get the waste line snaked)? Or is it a blocked vent that is causing the toilet to back up (i.e. should I try to clean my vents)? Also, is it possible that the bathroom was installed with no venting even though it passed inspection by my county (Montgomery County MD)?