If your data usage suddenly jumps without explanation, it could be due to bandwidth throttling by your ISP. Bandwidth throttling is when your ISP deliberately slows down your internet connection in order to conserve bandwidth or improve network performance. There are a few ways to tell if you're being throttled. First, check your internet speeds at different times of the day. If you're consistently getting slower speeds during peak hours (usually evenings and weekends), that's a sign that you're being throttled. Second, run a speed test from a website like SpeedTest.net. If the results show that your speeds are much lower than what you're paying for, that's another sign of throttling. If you suspect you're being throttled, the best thing to do is contact your ISP and ask about their policies. Many ISPs will throttle users who consume large amounts of data, so they may be able to give you more information about why your speeds are slow.