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That sounds well dodgy. Send it back and get it fixed you muppet.
I still don't get why mine calculates a 'return to start' when I split a route in RWGPS. It'll be a 200k section and the Garmin will go 'calculating' and then tell me it's 380k to the finish! Because the stupid thing has a dead straight line going from some random point back to the start. It gets a bit flakey when you meet said random point. Normally it just recalculates but it has restarted a few times before.
Other than water ingress, mine is actually pretty good.
Garmin's famous consistency...