Problem with my Avanti

[veg-o-matic]

Greetings, everyone.

I have a Zenith Avanti System 3 model SLTEYSEQT2535X that is my daily driver and is currently experiencing a problem I hope someone can help with.

Several times in the last couple of months, after 30 or so minutes of watching, the picture disappears by shrinking horizontally. The set remains on, and the channel number changes to what looks like a combination of 2 and 3 (3 is the channel it was set to.) I can't remember if the sound stays on or not. There's no burning smell or anything alarming and (so far) I can fix the problem by just turning the set off an on again.

Just before the picture disappears, it "flickers" horizontally a couple of times. The picture doesn't disappear every time it flickers, just some times. We watch this set for about an hour a day and the flickering occurs every day.

Anyone have any idea what might be wrong here? I'm hoping it's something simple, as anyone who knows me knows I'm not at my best poking around inside a TV

I'm attaching a picture of the chassis, in case it helps.

TIA for your help!

veg