Support Incoming/outgoing calls automatically hang up, after screeching voice

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http://androidforums.com – Hello guys, I just bought the Samsung Galaxy Ace, and I've been having a problem almost from the get go. The issue is that every third or fourth incoming/ougoing call is automatically dropped by the phone, with the message "hanging up". If I try to call someone, I'll get a screech noise (like when you call into an analog modem), and then the phone will hang up (I will see the message "hanging up"). And its the same issue when I try to receive certain calls. This happens on every third or fourth call. Here are technical specs: Model number: GT-S5830i Android Version (General)