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Hello everyone. I love my tp-link Archer C1200 V1 router, but I've had some problems with 2.4ghz devices not getting any internet access. I recently factory reset the router, turned off WPS under System Tools - System Parameters, and then turned off SPI firewall under Security - Settings. After this I enabled ipv6 using the Comcast settings and I've had great consistent connectivity for the last few days. No guarantee, but disabling WPS and/or SPI firewall (combined with IPV6) is something you may want to test out on your systems.

I hope this helps!