I would like to warn you about this issue again, yesterday I used LiveView and puted D7100 with Sigma attached back in the bag with Image Review still ON, I thought it will turn off by itself after one minute, as always with this lens attached.
After 45 minutes I opened the bag and LiveView was still ON, battery drained almost 50% and everything very hot, I think camera was around 70 degrees Celsious.
Apparently when I putted camera in the bag, I used Preview vutton while still in LiveView, so after one minute Preview was OFF but it was LiveView that was still ON and it was running for 45 minutes in the bag.
I tested the camera and everything works well, so after I leave it OFF for 15 minutes the temperature was normal again.
Maybe this should be sticky, people should be warned for this issue with this camera/lens combination.
It produces wery good results, but we need to be very careful.