What are your programmers at Garmin doing all the time? This bug, which causes the watch to crash during an activity when listening to music through headphones, has been around since the watch was released in September. It can't be that you still haven't found the cause after more than two months? @kuzan has posted a very detailed bug report on the forum. The one from my Venu 4 is identical. And there's no need to recommend updating to version 15.16. The bug occurs with this version as well. Please fix this Bug asap!