For those having problems, are you in one location and having these problems?
Or are you experiencing the same problem across multiple locations?
Does it clear with a reboot or when toggling airplane mode on and off?
If it persists across multiple locations it's likely a phone / APN problem. If single location it's probably tower based. Bear in mind that faulty towers may not hand you off to the next tower correctly (toggling airplane mode can clear this).
Monkey see, monkey do.