Have the same problem with my Jensen. It'll come on randomly. Might be a week, might be a month, but it'll come on from time to time. And it's not the weather alert or alarm. I also notice that it'll come on if I cycle the battery kill switch in the coach. So perhaps something is interrupting the power to the Jensen. Don't know and have never really perused it. I just make sure I always leave the unit on bluetooth so I don't get blasted awake with a crazy radio.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS