Moved and data usage dropped 40%.

Not really a Cox issue but thought I’d throw this out there. I recently moved from east Phoenix to north Phoenix and my data usage dropped approximately 40%. Either my WiFi was hacked or the Roku Ultra I was using was sucking up a lot of data when the tv was off. I purchased a smart tv so haven’t used the Roku since moving. I’m pretty protective of our WiFi but could have been hacked. Anyone else notice a significant drop when not using Roku? I dropped from 905 GB to 573 GB. 
Thanks