Android : Android Application fails while running in device without debugger attached

I have an android app engine connected application in eclipse. All the datastore operations are performed in background using Asynctask and intentservice. My application works perfectly fine while debugging in eclipse. But when I detach from debugger and run the application in my device, the application fails and I get message of Application Not Responding on button clicks.The android version in my device is 2.3.6.

What may be the possible reasons? I am not sure but I doubt some database concurrency issues may also be the reason.