I will never in my life buy a Garmin product again!

[Skylark]

No, checked all of those but why would it take you off the highway then back on the highway at the same place?

That is really unusual because despite some aspects often not being optimal on Garmin devices, especially using them with a computer the actual routing performance is normally great. And it would seem it’s not the gps location service that’s glitching it’s the programming that’s out of whack.