There are a few things. First restart your modem and/or router (I got a Spectrum modem and router long about NOV-1 and I had to reset router TWICE today due to other reasons )Q(@#$*@#) POS) (If I string a cat-5 from modem to "office" (router is in other room) I may send the POS back to Spectrum) What's worse is I have to reset it via the internet.. Can't do it via local control.
But do a scan of Wi-Fi nodes live in your area.. MANY routers come factory set to 6 You will likely find a lot of 'em on 6 Don't matter if they are encrypted or not... You need to be at least 3 channels away from most of them.
Channel 1 is.. Well. I'm licensed for a whole lot of power on Channel 1 (Compared to your router) so are a lot of others.. Now I, myself, do not use 1 But I don't recommend you do either.
Those "Wi-fi" war dial apps can be your friend when it comes to finding the least popular channel.
Another thing is that today Streaming Video is getting more and more popular. I've done it myself. But it eats bandwidth (I prefer to download and watch off line and can do that with MOST you Tube videos even though hoops are required)
Just now I'm streaming audio.. Multiple streams (two of them ham radio related one music)