UR12 Distorting and Playing Track half speed...

Hey, just seeing if anyone can help. I just bought the UR12 a couple weeks ago and run it with GarageBand on my Mac. A couple of days ago it started distorting certain parts of the songs and starts playing them very slowly. It’s inaudible, almost like a distorted record played at the wrong speed. It happens randomly and when I plug my headphones into the Mac directly nothing is distorted at all, however it makes it impossible to record further at times. The error message reads, “Error while trying to synchronize audio and midi. Sample rate 41,495 recognized. Check conflict between external device and GarageBand”. Anyone know what to do? It happens even with just a guitar direct in. I’m lost. Thanks!