Help! Electrics gone crazy!

[Deadmeatdad]

Last night the clock and date changed themselves, reset them manually as they wouldn't link to GPS. Thirty seconds later they reset themselves again. Set off on my planned journey and the sat nav tripped out claiming it was out of date and needed an update. Obviously couldn't do much about that on the M1 but lo and behold two minutes later it started working again. This is my sixth Hyundai but it looks like my last.