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My Garmin 450 has "frozen up" - not responding to anything, and is not locked. I've googled around and it appears to be a fairly frequently reported problem, but I can't find any solution other than contacting Garmin Support.
Has this happened to anyone and if so how have you solved it ? All I can do for now is run it flat and see what happens when I recharge. I've had it since January with no problems at all, and I was quite happy with it.