In another "solved" thread users are complaining of their phones locking up after taking a picture with the flash on. It seems somewhat random and not related to anything else. Some indicated resolution after charging their phone, which seems odd.
I had the same thing occur to me the other evening. I was taking a series of pictures when one of them locked my phone on a dead screen. The only resolution was to remove battery and restart. The next evening I took another series of photos with no problems. My battery level was about the same both evenings, probably around 65%.
I was following another thread on another forum about SD cards installed in the Charge. Some were installed with class 4 cards and some with class 2 cards. Class 2 is definitely slower than a class 4. (Class represents the write speed of the card) When taking high resolution photos or video there is a lot of lag as the pic writes to the SD card.
My thought is that our lock-up issue could be caused by lack of throughput to the card or a memory over-flow. Maybe someone with more technical expertise could chime in here . . .
For those that have experienced the issue would you please post the Class of your SD card here. The class # can be found next the where it says 32GB. The number is very small in a circle.
Mine is a class 2.