Quite a strong powerful posting, message wise, for your very 1st post. ;-)
I've had no issues at all when using 3G so far, though I believe 3 or 4 other forum members have mentioned problems when using their 3G connection.
Not sure how many of the other 3.5 million new iPad3 owners have experienced similiar issues. ;-) Though not all will have or be using 3/4G of course. So, based on a handful of users with this problem, and little feedback so far from the other 3 million+ I think it may be a bit premature to begin calling it a 'GLOBAL' issue for everyone.. well it can't be 'ALL' as mine, and my youngest sons new iPad3 would have the same problem.
So that's 2 I know of that are working okay...lol.. unless it's something lurking inside waiting to happen, certainly hope not, though as more and more users get round to using their 3G we may get more. It's certainly early days yet to form anything definitive. Lets hope it's just a few thats affected. It may also be the network provider itself that may be causing the odd problem.. so that also needs to be diagnostically eliminated.
As the previous poster stated, simply return it and get it replaced.. but I think I would be trying another 3G Network provider first.