John,
When you have the problem have you sent a route from
https://plan.tomtom.com/en or is it a route that you entered through the Camper Max?
I have tried both for longer trips and so far it looks as though the blanking of the screen happens when I have created a route in the online planner and synced it with the Camper Max. Simply searching on the unit hasn't had a problem.
I am going to do some more research as I have a trip to France coming up and I'd rather not have to enter one stop off at a time!
It was also much simpler when you logged a ticket on TomTom and someone tried to fix the error.
I have a Rider 410 for the bike and I use a different email and login for that. I created a new Gmail account especially for the Camper Max.