Default [Q] Hyperdrive romRLS16 phone issues ! PLEASE HELP !

I have an at&t samsung galaxy s3 and i flashed hyperdrive rom (RLS16) one week ago and i just realized that when people are calling me, sometimes I can answer them, and sometimes i'm not receiving calls. When i receive calls, the vibrator and the ringtone are not working... also, I tried to go to my voicemail several times by holding 1 button or *81 and it's not working.. I love this rom but i need my phone to work ! What can i do ? thanks a lot !