Apologies, forgot to add some info and couldn’t edit my comment for some reason.
I had this same issue when doing a go around at NZQN in the A320N V2.
Approach was the RNAV RWY 23
All systems were frozen but only visually, I still had control of the aircraft but could only see my telemetry using navigraph. I am on SU15, with the latest airac data and have the asobo scenery for queenstown.