Had the very same issue with a Dell Inspiron 17. I replaced the built-in wifi card thinking it was failing, but this didn't resolve this strange issue. This is NOT an issue with your Spectrum router, but the problem can be resolved by changing the router setting to limit it to broadcasting only on the 2.4ghz channels. The option of buying a USB adaptor is also a fix, but a little clumsy for a laptop in my opinion.
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