I bought a used JVC

I bought a used JVC HR-S3901/3911U S-VHS VCR in July on eBay. It worked fine for about 20 hours of total use in the last 4 months.

Suddenly, I put in a pre-recorded EP tape, and it plays fast (both video and sound are speeded up, but not like in Fast Forward). As a work around, I found that I could use FF for a few seconds and then hit Play, and the tape and audio would be normal.

This lasted for about 15-20 seconds and then I started getting horizonal lines on my screen. More and more lines until suddenly, there is no picture or sound, but just the TV's default blue screen.

Then a few seconds later, the picture and sound return, but 15-20 seconds later, the whole process begins again.

Is this just a matter of cleaning the heads? It just started doing this without warning. I do remember, that the time indicator light was blinking for a few days. I couldn't reset the clock (from CDT), until I disconnected the power cord. I counted to 10 and replugged it in, and I was then able to manually reset the clock. I didn't try using the recorder until a few days later, and thats when all the problems started.