This is not just affecting the Bionic. I have  2 Samsung Charges and a Revo. I have been getting intermittent 4G service (4G symbol goes away and / or network not available) for the last 2 weeks. Local VZ store manager says he "got word" there was a regional issue with the service, but no date on when it would be resolved. (Their own phones do it) Customer service is no help, they offer no explanations or ways to remedy the issue.