Call blocking app closes by itself

[qanda]

I have been using Pocket Call Bouncer on my devices, since it blocks the undesired calls and does not allow them to be sent to voicemail. Few other free apps can do this.

However, since installing it on my HTC Touch Pro 2, I notice that it shuts down by itself.

It worked fine on my HTC Touch Vogue running the same 6.5 Pro.

If there is a conflict, I can't find it. Normally, there are no other apps running at the same time except email and the Today screen.

Any ideas on how to keep it from shutting down?

Thanks
QA