It means EVERYTHING. Like I already tried to explain, "problems" tend to be over magnified on the internet. If the OP is just repeating something that he heard on the internet that was likely repeated by somebody else who read it on the internet, etc, etc, whose brother's cousin had a legitimate issue, then my point is valid. If he actually has some experience with a large sample of Glocks in the real world, and is basing his question on that, then I stand corrected. I doubt that latter, because otherwise this thread would not exist.
I'm not calling you a liar or trying to invalidate that that you are anybody else here has a problem. But the probability that the OP buys a Glock and experiences the same problem as you is extremely low.... a much much lower probability than one might think based on internet chatter.