Motorola Atrix 2 :: Can Only Make Call On Speaker Phone

I can only periodically make calls normally by placing call and then putting phone up to my head and listening to phone ring, and person answer.For whatever reason then the phone will behave erattically. It will only let me make a call using speakerphone.I cannot put phone up to my head and listen through earpiece, and the phone doesn't black out when putting up to my head.I guess the proximity sensor doesn't work or is buggy.Also, sometimes when I double tap on the Home button/key to start voice dialing I should be able to hear the phone ask me what I want to do, but I can't hear anything but I can see on the screen that It is asking me a question - but can't hear anything as I normally should.Then, a few hours later it all works beautifully.I have rebooted the phone, taken out the battery and put it back in, hard reset the phone.I even have just now taken my screen protector off and the phone worked for a few calls as it normally should - i put phone up to my ear and screen blacked out and I could hear other person on earpiece.Then about an hour later none of that worked.I could only use the speaker phone.the phone didn't black out when making a call and putting phone up to my ear, and the double tap home button/key invoked the voice dial interface but i couldn't hear the voice/phone prompt like normal. and confirmation of my commands

The level 2 tech support at moto didn't help with any more troubleshooting than what I have already done.Which is: restart phone...reset phone to factory settings (hard reset) wipe all data off phone...taken off screen protector...none of this worked and produced consistent results to say that any of these procedures produced a positive change in the phone.I am within my 30 day trial period of this phone purchased from Motorola.