I have the same issue but my circumstances are a bit different.
I recently broke the screen of my phone (Droid 2 Global) and sent it to Motorola, who replaced it. I got my phone back yesterday and turned it on. It worked fine for about 6 hours then I continually got this message. After taking out the battery, plugging and unplugging it into the charging, and hooking it with my computer several times, I finally got the phone to fully turn on without give me the bootloader message. I did a hard reset. Once again, the phone worked fine for about 12 hours, then soon after that the same issue occurred again. I've never rooted my phone, or attempted to technically alter it manually.
It should be noted that I believe charging my phone is the root of my problem. It originally began when I received the phone from Motorola and plugged it in to my home charger to charge it. After the factory reset, everything was fine until I charged it using my car charger.
Anybody have any suggestions?