Hi I foolishly let the auxillary Battery on my Gen 4 go flat and it's barely holding 12v, and only for less than a week. Anyway, my problem is a couple of malfunctions which have appeared since. First the HUD seems unusable. On the adustment screen it won't move up so I can see it (and maybe it's also not actually on). The yellow bar stays at the bottom. Secondly, the clock was out by the best part of an hour but when I finally tried to adjust it the clock settings have disappeared, along w