You did say any and all ideas so here's mine: Find someone with the exact same cable router and take your messed up one over to their place and swap it in place of theirs. Then you'll know if your router is bad and you won't be putting them out too much by bringing their good router over to your place to test. Other than that I've no suggestions, I don't know enough about them to hazzard a guess.

Good Luck.

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