I bought a UR22C back in February. It’s been working great, but recently I noticed that when sending the same audio source to both inputs (using 1/4" cables), channel 1’s gain needed to be set noticeably higher (with more noise as a result) to get to the same recorded level as input 2. The difference kept getting worse until I couldn’t hear anything out of channel 1 no matter the gain setting.
However, recently I’ve noticed that if I leave the cable sticking out by a good half-inch or so, channel 1 works normally. I’m uncomfortable doing this, because that does not make a secure connection.
The interface’s serial number starts with YEZ, if that helps.