Nighthawk CAX80 modem/router drops connection daily, including LAN

I've been having issues for a little over a week now with a 9 month old CAX80, my internet went down for scheduled work by Xfinity and since it's come back, I've been having security certificate issues in chrome on all my devices and my network goes down multiple times a day for maybe 10 or 20 minutes at a time or until restart the router. When it happens, my local wired connections go down (which makes me think router problem,) but wifi stays up without connecting to the internet. Has anyone had any experience with this sort of thing? I've asked neighbors and xfinity, it doesn't seem to be happening to anyone else here. Also, did a new firmware come out recently? I'm thinking of downgrading and seeing if that changes anything.