I've had my K2 for a couple of weeks and everything looked fine. Today I downloaded a clip to my phone via the app to view the footage. The picture quality is great but the speed displayed is way out. It changes as I speed up but it's way too high and for some reason, half way through the clip the GPS trace goes in a straight line between Bristol and London and back, then carries on along my route.
My GPS module is in the open so GPS reception should be a problem.
I other issue is that all the place names on the map appear to be in Chinese.