Garmin Edge 800 took me to Norwegian Sea

Strange on this! I was out on a lengthy ride using my new Garmin Edge 800. My distance was recorded at around 45 miles. I looked away and then looked back and it had suddenly jumped to 522 miles! When I got home I downloaded my route and the map on Training Centre showed I had taken a very fast detour in to the Norwegian Sea!
Any ideas what happened and how I can correct my Training Centre entry?
Any ideas what happened and how I can correct my Training Centre entry?
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Here is one such recent thread. You can export to another app and edit out the bad bit
https://forums.garmin.com/showthread.php?t=16262
I notice that one poster said he'd had no problems since updating the firmware - must be worth a try.
I must admit I avoid using 'routes' with Garmin GPSes - it's better to use tracks or waypoints (or custom POIs if these re to limiting).