Apps freeze on launch

Hi.

I have a iPhone 5 running 7.0.4 JB with evasi0n.

Sometimes when i try to open an app, it freezes on the app launch screen for about 15 seconds. I have to quit the app and open it again to make it run ok. Sometimes I even have to quit the app in the switch in order to make it open...

This happens with every kind of apps.

I've already restaured the iPhone, re-jalibreak, but this keeps happening...

Anyone knows what I should do?

Thanks