The navigation cursor gets stuck during track navigation

For some time now, I’ve been experiencing a problem where, during track navigation (primarily walking/hiking), the navigation arrow (dark arrow) occasionally gets stuck at a point on the planned route and usually points in the wrong direction, whilst the unfilled cursor arrow (actual position) continues to move correctly with me. This naturally leads to an increasing discrepancy between the two cursor arrows, and once I’ve reached the distance I’ve set, I receive a deviation alert telling me that I’ve strayed from my planned route.

Which, of course, isn’t true, as I’m still on the route; it’s just that the navigation arrow has got stuck.

This usually happens once or several times per trip, mostly when I’ve stopped briefly, but sometimes for no apparent reason. These are ‘normal’ journeys from A to B without any return legs.

If I then switch the GPS off and on again briefly, it works fine again. As it happens quite frequently and beeps every time, it’s a bit annoying. What could be causing this and how can I fix it?

As I don’t have a screenshot and it’s difficult to simulate the situation at home, I’ve drawn up a schematic diagram: