Motorola W755

This is my 2nd w755 and I will never buy moto again! How is it that when you have the phone on vibrate mode and u get a call, it starts playing a ringtone and then locks up? I have had to pull the battery out every time to get it back to "normal". I have already done the software update that verizon recommended and its still not working right. Also, I can have my boyfriend call me (we are on the same account) and my phone never rings on my end, and rings 6 or 7 times on his end. What good is a phone if its not functional? Never motorola again!