Ptrap drips after sink is used

[stevedam850]

We put in a new vanity and ptrap. While water is running there is no water leaking. After we leave the bathroom there is a little drip coming somewhere we don’t know.

All the plastic nuts are tight.

 

[Snoonyb]

It looks like the sink tail piece/trap connection is crooked which will cause the washer to seat unevenly.

How you check where the leak comes from is to wail until it happens and wrap your thumb and forefinger around the tail piece and trap to see which stops the leak.