Hi Karen
If it really has been a long while, you could have a GPS rollover issue.
Try entering the date, time etc and start up as you did before.
Then, go back in and check what the current date and time are. I will guess these have now changed.
Also, check what version of firmware you have.
If the date did change on you, then I am fairly confident you have the rollover issue.
This
site is the one I used to fix this issue on an LX90.
Good luck
Philip