Any troubleshooting recomendations for cable internet?

I recently moved apartments and I'm leaving my beloved Google Fiber behind for some Spectrum cable internet that's included with the apartment (and I don't have any other choice). The issue is, it seems like I keep randomly losing connection and because I'm using my own router (but their modem) the Spectrum tech support hasn't been super helpful. For example, this morning I woke up and internet on my phone wasn't working, on my desktop I could ping stuff but it took ~20 seconds for the first packet to go through, but my router could ping things instantly. DNS was working if I got it from my router, but I have two PiHoles that I use for DNS with the router (running Unbound) as upstream. Rebooting the modem actually fixed it in that case, but I'll still have momentary drops here and there.

Anyone have any ideas of things to check? I've thought about going to Lowe's and buying one of those coax cable testers but I'm not really sure if that'd help much.

EDIT: For what it's worth, I live in Texas and there was a massive windstorm yesterday... and I think it's possible that that was the issue 🤦‍♂️ I haven't definitely confirmed that, but it seems to be stable since the wind stopped and the wind did cause at least a couple of outages in the area.