Hi, I'm sorry to hear this. Please let me know if you plan on visiting a dealership for this concern. I would be happy to open a case for you.I have a 2018 JLSS with 25K miles and the 7 inch Uconnect system. I am having what I believe is the same problem. Sometimes when I start the jeep the volume of an FM station will be very low. I normally listen at volume level 8 but when this happens I have to turn it up to 20 - 25 to hear the radio at the same volume level as 8 normally puts out. Also I noticed that when moving the volume will fluctuate louder and softer every second or two. I have tried turning off the speed adj volume but that has no effect. Service bulletin S1808000155 states that changing modes from FM to AM will correct the issue for that instance (posted in another thread). Next time it happens I will give that a try. I have noticed that when it happens if I shut down the jeep and restart it, the problem goes away (hence I have not been able to get the service department to see it occurring).
Im having the same issue, except I only listen to my phone via Bluetooth. The volume will randomly droop out of nowhere with no input or notifications. Did you ever get it figured out?No end result - it's still intermittently an issue. It's definitely only the FM radio, any other audio source I choose behaves as expected.