Turn off 4G it does not work properly if you turn it off and just use 3G you will have no issues.
I tunred 4G off w aweek ago i now get full day of battery no issues with dropped or lost calls no SM S issue or emails issues
Apparently Samsung does not know how to fix the Issue look over at the S3 forum they have very similar 4G issues. with the galaxy s3.
I tried this about five months ago. It certainly helps but doesn't totally resolve my problem. Connecting/disconnecting from Bluetooth, WiFi, swapping towers (driving somewhere) exacerbates the problem. If I only use 3G, leave Bluetooth and WiFi turned off and never go anywhere, I might go a week without losing my radios and having to reboot to resolve.
Today, I went into my local Verizon store to see what my options are. All I said was that my radios die and the rep interrupted me, told me that it is a known problem and Google will have a fix soon. He assured me that they were very good at this. I explained to him that this problem has existed for nearly a year and that I had been in about once per month for the past 6 months. In April, they told me 4.0.4 was going to be released in May and that was going to fix it. I finally saw 4.0.4 in June and it didn't fix the issue. He then told me that there was nothing more that he could do.
So now I'm apparently stuck with a phone that I have to reboot at least once per day for the next year and a half. I don't think we're done here...