My BB Z3 taking alot of time to call someone or to receive a call. I updated my Z3 to OS 10.3.2.2836

I'm having this issue only after i updated it to OS 10.3.2.2836. My Z3 is unusable now. I really love this phone. I badly want to solve this issue. Other than this issue, the update is fine.

Reload the OS using an Autoloader....