Was out Saturday enjoying the weather when the unit blinked to vertical lines on the right 1/3 of the screen. Left 2/3 worked fine all day. Any ideas or suggestions as to what could cause this? Thanks in advance for any help.
Don’t sound good!
You’re going to have to call Lowrance customer support I’m afraid. I’m not a tech, but it sure sound like a display to me. 
time to buy a humminbird! 
I have a 334c and it just pees me off! I have a 520c for sale too! Iam done with lowrances 2 or 3 year depthfinders. 
The issue you are describing is a bad screen and you will need to send it to Lowrance for repair. As these units age they can develop problems like all electronic devices. How old are your home computers you guys are using? Once they get 5 or 6 years old they can develop problems too. Another thing to remember, we don’t hear of the hundreds of 334’s out there that are still going strong.
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