LG enV VX-9900

I have had the lg envy for about 6 months. During that period it has frozen up about 4 or 5 times. I get the verizon logo and nothing else. Once I remove the battery and then replace it, it works fine. I took it to Verizon and had some type of a software update done. After that, I still get the freezing. Any suggestions?

Thank You
Eric