E120 random reboot

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E120 Classic. I have a similar problem but no wiring have changed.
First, I noticed flickering in the display. You told me to delete some tracks, which I did and that stopped it.
Now, after a while, and more tracking, the display turns off to the start screen about every 5 minutes. I push the agree OK button, it asks to select a page pattern (which it normally did not), it opens a page of Miami harbor (where I have not been, I am in the Bahamas), and then searches and works, fine for about 5 minutes.

I have only one track. I looked at all my routes and tried to delete some but it says cannot delete route at this time.
Should I reset the whole system? I have the latest firmware.
Thank you
Wolfgang, SV SeaLife