I first want to thank the all mighty flying spaghetti monster that Comcast does not operate in our area (although Spectrum isn't all that great either).
If you're using the AP and router that your ISP provides you, don't expect quality, nor anything decent. They are designed to benefit them with low costs, and whatever else they want to throw on.
A cheap straight router and a nice Ubiquiti AP, then you have everything you need for about 150 bucks, and it will be faster, more stable, and likely more secure than what your ISP throws you.
It's the same reason why you should almost never use the locks storage companies give you, as they are probably some cheap 4 pin cheaper than master lock chineese shit.