MaxxFan

I have a problem with a MaxxFan 4000K. When I installed it a couple of years ago and went to use it the lid would reach maximum opening it would still try to keep on opening for another 10-15 seconds and the lid would be bouncing. I an sent info request to MaxxAir and got no response. Recently on my trip south to Arizona the lid started bouncing all be it self and now will not remain closed. Had to tie it down with tie wraps to continue my trip. Have sent another request to MaxxAir, no response. Has anyone else had similar problems and where can you get parts? Should I consider this unit as junk and replace it with a Fantastic vent, have one of those in my motorhome for over 10 years with no trouble. Had trouble years ago with a MaxxAir fan that was installed over a roof vent and never got a reply from them then. It must be their company culture. I will never buy any more MaxxAir junk!!!!!

Here I sit frustrated in Yuma