Sudden harsh lag spikes as of only recently- Been with Xfinity for 10 months now- Help?

Hello,

I've been using Xfinity internet since December of 2024 and it's been just about smooth sailing from then until only a few days or so ago- The occasional speed drops on desktop, but since I'm using it wirelessly, that's to be expected. However, as of only the latter stages of September 2025, when partaking in gaming and calling over apps like Discord especially I'd find the occasional massive lock-up in connection. These typically persist for upwards of a few seconds before dying down, but have been growing rather plentiful in frequency as time has progressed. I'm especially concerned that it's persistent now, since a part of me assumed nearing the end of my month (and by extension, coming close to my allocated data usage) was partially the cause.

I'm using the standard white XFi router and reside in Justice, Illinois, for reference.

Any assistance in diagnosing the issue or finding a culprit in the matter would be much appreciated.