I had the same issue pop up a few weeks ago. What I did to fix the lost presets is establish a xm sirius profile in the Uconnect settings, then set all my presets and I also saved all my profile settings (seats, mirrors, etc) with my memory preset of #1. Then I synced the profile with my keyfob. I just followed the vehicle manual instructions and had it done in about 3 minutes. I have been able to retain all of my presets since doing this procedure!
I’m having the issue where I keep losing my presets with my 12” screen. I just noticed it about 10 days back but I don’t drive the truck often, so could have been a while. I dropped it off at dealership and they tell me to wait for an update on 8/24/2019 and refer to Star Case S1808000147. WTH?!??! We’re paying $65k to $70k for most of these trucks with the 12” screen and Ram can’t provide a working feature as basic as a preset?? I believe this is my 5th visit to dealership since I bought it in October of 2018. I’m becoming very disappointed and dissatisfied with my Ram.