agree on some of your points .. First an AC router is required for optimum performance .. But, most likely the current router picks the broadcast channel automatically .. recently there could have been some environmental changes affecting that selection .. The OP might not have the skills required, but it is relatively simple to go into the router and set the broadcast channel .. An internet search will reveal the allowed channels for 2.4 and 5 ghz transmissions .. that will show the "best" alternate channels to broadcast via trial and error ..
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