Pro 97 Question

[scannerman200]

When I am doing a service search with the pro 97, black lines move across the screen. Anybody else have this?

 

[KB4REA]

When I am doing a service search with the pro 97, black lines move across the screen. Anybody else have this?

I get those lines when I search ham freq's in the 200 mhz range.
I just shrugged it off...dunno why it happens.