Haha, of geweldig ;-).
Yesterday I tried what you suggested earlier. It worked for me! It recorded 1hr54min, so I guess the problem is solved!
Thx for all the comments!
Flight mode didn't work as well.. Problem still not solved!
I've received another possible solution; flight mode. I'll test this tonight. I'll report afterwards if this is a solution.
Like Francis says, GPS works fine and is accurate.