Thanks for the reply and link, but i don't think it's a RUT. The gps is showing the route as planned, but when i pass the first point, it changes the complete route : every point is still there, but it gives some bizar routing at every point, and then goes to the next point, where is does that again. So the route goes from 350 to 450 km's.
It doesn't let me go back to a previous point, like it would for a hard waypoint, it just goes crazy on every point and then goes further on the correct route.
If i stop the route and start again halfway, it does the same thing.
It doesn't send me back to the beginning either.
I have been working with Garmin since the gps 12 and the streetpilot III. This is a first for me to discover such weird things.
Recalculation ON is what MRA suggests, and worked perfect before, so what happened here i don't know, setting it to OFF might work, but that looks like a workaround to me, not a solution.
Even stranger that the XT of my girlfriend didn't have this issue. In about 2 weeks we have a roundtrip, about 170 km's, will see what happens there.
For now, i just don't know how to reproduce or resolve it.