Hi Graham,
It can take some time to set it up, but well worth the effort, I have a 12inch Meade LX200GPS and when set up well it works great.
As others mentioned, upload the latest software patch for LX200, this should allow the LX200 to maintain correct date.
For the gps issue, check that the small round battery behind the control panel that powers memory for the previous gps data is a new battery, if it goes flat the gps takes a while as it cycles through all gps frequencies to find the right ones for your position, saving it to memory allows it to find gps Coordinates quickly.
Hope you can get it going well soon, regards, Wayne.
Lots of good advice for Meade LX200 on this site and the ones below.
GROUPS .IO - LX200GPS , LX200ACF, LX200R telescopes and their Autostars
https://groups.io/g/LX200GPS
CLOUDY NIGHTS - Meade Computerized Telescopes
https://www.cloudynights.com/forum/9...ed-telescopes/