@Ton-Machielsen I share your pain. I believe something has happened some weeks ago which made MRA behave differently. At least on my phone, for my routes. I my case the app always recalculates if deviate from my route, even when a)navigating as a track, b)with automatic recalculation disabled and c)skip waypoint enabled.
I would like to see that the app has a way, when I deviate from the planned route, to stay quiet and to guide me to the next point in sequence as soon as I am back on the planned route. That's how it used to work. I have submitted a bug report on this but it has not been addressed yet as far as I know.