Soundbar Subwoofer Connection

I have a Polk Surroundbar SDA and the soundbar doesn't keep a connection with the subwoofer. I have a constant blinking amber light and the sub has an amber light as well. The speaker itself works but no subwoofer connection. I followed all the owner's manual instructions (shut both off, turn back on, checked to make sure they were both on the same channel) and I also shut off my internet modem to see if it was interfering with it but it's not. It's worked fine for years so I don't know why it would just stop. The sub's only about three feet from the soundbar.

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