Internet connection drops off in the evening

Hello there, I'm having a bit of trouble with the internet service we currently have. We're on the Preferred Plan currently in Cleveland, OH, and I've been noticing in the last month or so that our connection to the internet seems to completely drop down to nothing after 7 PM EST. During the day, connecting to any page on the internet is very quick, but just in the evenings it take 5+ minutes just to load a single page. And it's not any particular website either, every single one does this. It's also nothing to do with our computer as the computer programs work just fine any time of the day (even things that I assume use some sort of internet connection like the various apps for Windows 10 work like a charm)

So I'm wondering if this is an isolated incident with our home/area, or perhaps other people are experiencing this too? Or even if there's some sort of simple fix to get us back to where we should be.

Thanks.