Static Coming From Speakers

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Hey All!

I'm hoping to get some suggestions on what to do next with my "staticy" speaker surround speakers. A few months ago static started coming from the right surround speaker during blurays, and then while watching TV too. It would start a little soft, but gradually get louder, sometimes getting so loud we just had to turn it off.

I unconnected all speaker wires(16 gauge) from receiver and speaker and inspected hoping to see an obvious problem. Nothing. Plugged everything back in. Things were fine for an hour or so, and right back to it!

So I figured the wires were going bad? They were a few years old at this point.

We went without surround and went back to TV speakers for a while (ugh.) until I ordered a whole new roll of 16 gauge wire from Amazon. Their own fulfillment brand.

I took a few hours yesterday, and redid everything, including banana clips for the receiver.

Worked like a charm for the rest of the day. Happy as a clam.

Now tonight, it started again! It seems to really only come from the one Right surround speaker, but I swear I heard it from the left at one point too, but I could just be dreaming that.

It's a Pioneer VSX-822 Receiver and Polk surround speaker set. Basic satellites with a sub.

What should I do?!

Thank you!