Hard to tell. I'm on my second one- the first lost all data connectivity, so no uploading or downloading of courses and ride data. That was replaced under warranty with a refurb from Garmin. The second one suffered extreme flakiness after a sodden FNRttC last year, was sort-of-repaired by a third party firm (who fixed most of the issues but AFAIK didn't check it over properly- the backlight on the start/stop button wasn't working and still wasn't). This one, on occasion, like your own, switches off of its own accord (I think the first one did too). Everything else, touch wood, works right. The battery life went (I doubt Garmin fitted a new battery), but that's been replaced. All I can suggest is keep using it for the time being, keep a watching brief, and if you do have any more issues get onto Garmin UK, their warranty support is pretty good (officially they do not honour warranty on eBay purchases, but I didn't have any problems).
