The same thing just happened to me! From 1/24 to 1/30 the highest amount of data I use is 25, then all of a sudden on 1/31 it spikes to 262GBs in 1 day, the next day it's 249, then 166, and 130! Before the 31st it never went past 50GBs, but all of a sudden it's 3-5 times that in 4 days! They need to fix this crap because nothing has changed in my household, yet here I am already over 50% of my data usage! None of the last 3 months shows that I've exceeded 500GBs in each month (Oct: 333GBs, Nov: 270GBs, Dec 464GBs), and now all of a sudden I've exceeded 500 in 2 days?! Hell no!
Edit: Only change that has happened is that I've connected a cat8 cable to my docking station, but that should not be causing a 200GB+ change per day!