We have that model in our challenger 37FH. At first it worked well for the first few months. Then we noticed GPS loss in place around home where we near got that issue.
We have had to do a reset with the reset button about 6 times over the summer months on our vacation travels do to the system freezing up and not accepting any transfer command to the radio, BT of setup screens. Lately I have pulled out our Garmin 760 RV that we used in our former coach and run both just to have a comparison.
Put in a e-mail inquiry into the parent company tech support in Elkhart, IN this week to see if they can give me some guidance on resolving these problem.
I'll make an entry if I get a response.