I just downgraded my radios to the 2.11.605.0 radios. Speed was not that great with the ota radios and i've had some sms issues, different radios work for different people.
Well yeah, 2.11.605.0 was a few leaks ago, not an ota. I've never just completely lost data without some explanation (had a 3g outage in my area a few days ago, but even then still had 4g and 1x). Maybe you have a hardware problem?