I'm a new Ram owner as well. 2020 Ram Laramie with the 12" UConnect display. I have the same issue with the weather radar where it briefly displays some of the rainfall and fronts, but then stays blank. I spoke with UConnect customer care and they were very candid this is a known issue and will be addressed in an upcoming software update. I know, a mystery software update, but when I pressed them on an ETA, I asked whether this meant months or years. The response was one month or less.
Bottom line is there "might" be an upcoming update that fixes this issue. I know there are skeptics out there and the next update has been compared with a unicorn sighting, but that's the news for what its worth.