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Twice I have noticed, this time after I had fully awakened, I checked my phone and at first had noticed it was hot. Then I noticed that my WiFi had turned off and Mobile Network had turned on, on its own!
Among other things, I don't have unlimited data which makes this a problem especially if I don't know the mobile network is on.
Why is this happening?
Having mobile data won't actually use your data unless you're browsing the internet so it should be fine. Try factory resetting it to see if it fixes the heating issue.
Ummm... data is used even when you are not "browsing the internet"... Android phones are constantly talking to Google services, syncing various services and notifications, locations services, etc.
Your phone being warm well charging can be normal, the Rezounds are known for getting warm especially when the screen is on. WiFi will disable by default when the phone is sleeping, you can change this in Settings->WiFi-(Menu)->Advanced and change "Keep Wi-Fi on during sleep" to Always or Only when plugged in.
Sometimes the Rezound's stock power management just get's stupid too... hate to say it but it's true... Also check out Hidden Settings in the Play Store to change low battery power saving settings.