Hi all - I need some help troubleshooting my internet and really don't feel like dealing w/ customer service reps. I don't consider myself a tech savvy person, so I'm wondering what this community might know..

I've been having issues with my internet for a while. we have xfinity with a plan that promises up to 1000mbps. I'm lucky if i get up to 250 on a good day. beyond that, we constantly lose connection, or get very slow connectivity. i'm using a Netgear c7000v2 as my modem/wifi router combo paired with a Google Nest Mesh router. My home is roughly 1000 sqft footprint split level. my computer is in a different room, but there's no doors between and about 600 ft from the modem/mesh routers.

i called xfinity to talk about the issue, they said that my modem likely needed to be replaced. the initial modem was also a Netgear c7000v2, but i figured maybe the hardware just burnt out(?) they sent me an xfinity modem, and everything seemed to work great (still not 1000mbps, but definitely better). when I realized they were charging me more than I was willing to pay monthly for a rental fee on the modem, i decided i'd go back out and buy a new modem. i bought a Netgear c7000v2 again, because it should be able to handle those speeds, and to my understanding is a decent enough modem. i also bought a new coaxial cable to double check. but after replacing, my internet is still spotty and constantly goes in and out.

i don't have any device to plug directly into the ethernet cable (because it's 2023...), so i can't pinpoint the issue through that. i haven't had an xfinity tech come out yet, because apparently that takes anywhere from 6-8 weeks to get a visit...

any ideas on what i should do? part of me is convinced that xfinity is throttling my internet because I'm not using their modem and paying them a rental fee, but i don't want to give into conspiratorial thinking...i'm about to file an FTC complaint on them because I'm just fed-up at this point.