I've got a brand new Razr V3m and it's only been lasting a day on a charge. I noticed that it would be warm when I'd take it out of the holster too. After some research, I discovered that it will start scanning for an alternate carrier whenever it gets out of range from it's home carrier. I work in an area where you pretty much have to go outside to make a call, so it's going to be prone to scan for carriers regardless. In order to get it to stop scanning, I went into settings and changed the "Roaming" from Automatic to my carrier (Sprint in my case). So far my Razr hasn't gotten warm.