I am not sure if anyone else has noticed this, I have searched around a bit so sorry if this has been covered before but this is my second Droid X to do this. When I lock the screen, my signal strength goes from 3-4 bars down to 1 bar after a few minutes. When I quickly tap the home button, but do NOT unlock the screen I can see that there is only 1 bar, and even sometimes the 3G icon is gone, (i.e. no data is transmitting, but I am getting a cell signal). Once I unlock the screen, I immediately will see the bars jump to either 3-4, depending on my location, and/or the 3G will pop back up (if it was missing in the first place). My conclusions about this are that this is a reason why some devices crush the battery life and others don't. And, there is an issue with the phone hardware/software radio communications. If when the screen is locked it is losing signal and constantly going back and forth between 1x/3g/no data, that would explain why some people are having their battery dead within 5-6 hours. This phenomena is occurring on my second Droid X. I have yet to notify Motorola formally, other than through Verizon, but I wanted to see if anyone else out there is experiencing the same issues. Mind you, it is sometimes sporadic and others very consistent! There are times when the phone will be very hot in my pocket, and I suspect this is the reason. I know how to back out of applications and i can confirm that I do not have any running in the background that are sucking data. Please keep in mind, I experience this with and without task killers and I live 5 minutes from Downtown Minneapolis where coverage is excellent. I also do not use Juice Defender or any other battery management program which may cut data when the screen is locked.