When it wouldn't work properly I looked for some info on t'internet and found an excellent site and forum called DashCamTalk, which I have now joined. Needless to say my dashcam didn't receive such rave reviews on there with people complaining about battery and GPS signals among other things.
Apparently the best dashcams have capacitors and not batteries and one that comes recommended? for a little more than the Nextbase is the Viofo a119 which I will be looking into.