Dropping Calls

[PhatSRT4]

Hello,

I have the new Sprint Rom on my phone and when I am in my house or even on the patio (3rd story apt) I lose signal. It goes completly dead and says there is not a signal. Then it comes right back up (of course after the call is dropped). THis will happen over and over again. It renders my phone useless. Has anyone expirenced this before? Could there be something in my house that is interfering with the signal?

Thanks!