I have finally my D180 back from Dynon, actually a new one. After configuration I have tried to use it. It works ok with in HDG and ALT without the GPS (Garmin 695). With the GPS on and with a flight plan engaging NAV will result after a few minutes on ERR/ERR. and loss of autopilot. After a few minutes it recovers, but upon AP connection the same events repeat over again. We have checked all the connections and settings we find no problem