Latency Variation's and high ping despite seemingly good internet

Hello, I recently have encountered issue where I have very high latency variation across all games. It happened seemingly overnight and have tried all sorts of things to resolve the issue. I tried Nat type changes, advanced network settings changed, MAG type changes, even going as far as a factory reset on the console. Nothing works. I went from having 20-30 ping one day, to rubber banding at up to 300 ping the next. (It seems to get worse the longer the Xbox is on, but still lags even after a power cycle). The wifi has always been very consistent and I am on a wired connection. The internet has been tested and rebooted multiple times and always comes up to be running very well, around 9ms of ping. I don’t want to jump to a conclusion of a hardware issue (it may be something internet related I missed for example), but I don’t know what else to do. The Xbox is the only device having this issue in the household, despite changing the Ethernet ports supplying it and trying a wireless connection.

:)