Who I have the same questioned this topic

I have seen this many times all over the place but still can't find the answer.  We have 2 thunderbolts in our family and both phones do the same thing.  Says I have 4G but as soon as I open an app or try to use data it loses the data connection.  I have to retry several times before it will connect.  It gets to the point of rebooting the phone which doesn't even work all of the time.  This has happened so much that it almost makes this brick unusable.

PLEASE I'm begging anyone for an answer.  I have tried updates and phone settings....  I know I'm not the only one with this problem.