I noticed some months ago my Lowrance Hook2 9 splitshot lost the date and time. Nothing but dashes on the screen.
I contacted Lowrance and they said there was an issue with the GPC chip and not able to connect to satellite and they were working on a fix.

I checked their website yesterday and Lowrance has release a firmware up date on April 14th that fixes the problem.
I applied the upgrade to my unit and voila! Date and time sync'd up again.

The notes on the upgrade explains what the issue was.

Thought I'd share in case any of you experienced the same issue. :-D