Lowrance failing .. need recommendations

My Lowrance X-65 has suddenly developed a shrunken pic that doesn't fill the screen and info is cut off on the left side and has a blank line running down through the display with no picture displayed on that line. Otherwise still working .. just not perfect.

I have no idea why it developed this problem, I keep it in a storage locker on the boat when not in use, but it happened anyway.

So the question is .. I don't know if I should pay to fix it or change to another unit.

What is the best fish / depth finder these days for the once or twice a month fisherman?

All recommendations appreciated.