So this has happened two times with my Droid X2, I'll be getting a call, I pull it out of my pocket, I slide to answer, I hear NOTHING and I mean NOTHING. I even put it on speaker phone the last time it happened. (half hour ago) The call will end. I put it back in my pocket thinking maybe it was the other line. (bad service or something) I had perfect signal each time this has happened keep in mind. A minute later I'll receive a voicemail when I clearly answered the phone and it ended! Does that make any sense? I called the person back and let them know that I DID answer the phone and it ended so why they didn't hear me? Only God knows. And how they kept hearing a ring and got to my voicemail? Only God knows...unless one of you smart people here know or have had a similar issue? Hope anyone can help with this issue I have come across. Thanks! 
Cody21, thanks for your input. RIPCharge, I know this type of issue can be frustrating especially when you’re expecting a call or receiving a return call from friends or family. I'm sorry to hear you’re having this type of problem with such a great phone. I researched your issue in more detail and found some customers had this issue with their Droid X2 and we found a similar issue was due to the proximity sensor not engaging while on call, and other varying user physical characteristics. It was found that some calls are being terminated as the end call button is inadvertently activated and that customers may be experiencing perceived dropped calls due to lack of far end audio or muting. The recommended solution is to press the power button after a call is established to enable the screensaver mode to prevent accidental call terminations due to lack of far end audio or muting..
The trouble shooting steps suggested by Cody21 are steps we would also advise to fix issues with the functionalities of your phone. I will list steps below to clear cache, to put the phone in safe mode, and to perform a factory reset..
Steps below to clear cache:
From a home screen, select App menu (located in the lower right).
Select Browser.
Select Menu.
Select More.
Select Settings.
Clear cache
Select Clear cache.
Visited website content stored on the device. The cache enables the browser to download only the content that has changed since the last time a website was visited. Since the browser only downloads changed content, pages are loaded faster.Select OK.
Clear History
Select Clear history.
A listing of URLs (website addresses) that have been recently visited.Select OK.
Steps below to put phone in safe mode: Safe Mode temporarily disables all applications that have been installed via the Android Market. Performing this troubleshooting step can determine whether a 3rd party application is the cause of an Operating System / Application issue. .
To Enable Safe mode
Power the device off.
Press and hold the Power button then select Power off.Press and hold Menu.
Power the device on.
Press and hold the Power button for 3-5 seconds.Hold the Menu button until Safe mode appears (located in the lower left).
To disable safe mode
Power the device off.
Press and hold the Power button then select Power off.To perform a factory reset: Performing a hard reset will remove ALL data including the Google account, system data, application data, application settings, and downloaded applications.
From a home screen, select App menu (located in the lower right).
Select Settings.
If the application icon is missing, select App menu filter (located at the top) then select All apps.Select Privacy.
Select Factory Data Reset.
To clear all personal data, ensure Erase internal storage (media area) is enabled then select Reset Phone.
Enabled when a check mark is present. If presented, enter the current passcode or draw the unlock pattern.Select Erase Everything.
Perform initial activation setup process