My girlfriend has an HTC Eris and here lately she's been having an issue answering phone calls. This doesn't happen every time but does happen a lot - she'll get a call and will press answer on the phones screen and she then hears nothing. The person that's calling her doesn't hear her picking up, in fact with the tests we've done with my phone and a friends phone is that on the callers end it just keeps ringing as if she never picked up. She picks up she hears nothing, the caller on the other hand just hears the phone keep ringing. Any idea's what's causing this? She's not running any custom ROMs, in fact it's a stock phone up til about 2 days ago when I did root the phone - however she had this problem prior to that as well.