It's a Newmar issue. You should be able to swap wipers as Dutch Star Don suggested until you can get it serviced. At least with my wipers, there is a specific torque the nuts have to be at, in years past there have been posts where the nuts came loose and the wipers fell off!
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210