Hey there, I have my Samsung Galaxy S3 plugged into my MacBook Pro's USB port, and the computer is plugged into an outlet. I'm using the S3 as a mobile hotspot. Despite charging via USB, the S3 is gradually losing charge, at a rate of about 1% per hour, rather than charging. I'm wondering if it's possible that using the phone as a mobile hotspot could possible require more power than the phone is gaining while charging. Any ideas? Thanks!