I am using galaxy s9 too. Current TomTom NDS 1.8.6. Never having such issue.
It may due to your battery saving mode settings.

Quote Originally Posted by Janabc View Post
My tomtom stopt after one minute when i use the route demo.
This problem is started abouth 3 or 4 versions back.
Tomtom go works ok but like the nds version.
I use it on an samsung galaxy s9.