I had a similar situation on my front air, when it was trying to start it would kick out and then restart on it's own. We started to just leave the blower running on low all the time which seemed to help. I had already installed a hard start capacitor.
I had cleaned the AC unit earlier this year so I didn't think that was the problem.
After our last 6 week trip I took the time to go ton the roof and inspect. It seemed like the front AC blower motor was tight so I ordered a new one and replaced. When I got the old blower motor off I found that it was essentially seized up, once I got it turning it did turn but with much resistance. The bearings are not replaceable, after I got a new motor I tore the old one apart, both ends were failing.
The new blower motor, once installed would free wheel fairly easily.
Sounds like you have a blower motor going (or gone). Mine was a Duo Therm by Dometic. I went to this website to get the current part number as searches for the blower motor using my original parts list wasn't successful.
I found a wide range of prices on a replacement motor so it pays to shop around, ended up getting a good deal on one from Adventure RV that had been a store return, cost $105 including shipping. PPL had them for $125.
The replacement was pretty straight forward. Just took time and ~20 trips up and down the ladder to complete. While I had the unit apart I cleaned the condenser good with a air compressor.