Wow, Had that problem with a 2018 Chrysler Pacifica we turned in 2 months ago. Pain in the *** putting gas in. worked about 20% of gas pumps. Same issue, cut off every few seconds unless you held it at 20% pressure taking 5x as long to fill up. It was my wife's and she made me fill it most of the time for her. Had it 4 times in to check and they could not find the problem. Was a nightmare the whole time we owned it, horrible experience so that she would not get another one.
They blamed it on the pumps! if you can believe that saying some pumps are not following the rules making the pumps the way they are required to, small part on the end of the spring on the pump that is required does not exist on all pump nozzels. Idiots, blaming the pumps and not the vehicle!
Anyway, my dealers also very low stock on everything. Had a 2021 Bighorn Night Edition listed on their website, when they called me that the delivery truck pulled in and it was finally being unloaded, told them to hold it I would be there the next morning. Very low inventory around here too. All car inventory for 2020's and 2021's are very low inventory here in NY or at least where in Oct/Nov. Not just RAM, but everything we were looking at to replace wife's and mine. All blamed on covid and plants shutting down.