I am using the MiFi mobile HotSpot. Around November/December, my data usage jumped around 300% even though my typical use did not change. I have been using my device for many years and have had a steady understanding of typical usage. I was forced to enroll in an unlimited plan to avoid $300+ bills after the 5gb plan I was running $50-$70 typical. I am not sure how to troubleshoot. Thank you for any advice.