HUGE unexpected rating drop (2100-1700)
I'm also experiencing a slump in blitz. Down to 1100s from my peak of a little over 1400 a few weeks ago. Makes no sense.
It makes perfect sense when you realize that an increase in rating does not necessarily mean you are getting better. Unless it increases a lot and stays there, it probably means you are not getting better. It just means you are the same player with the same plans playing the same kinds of games over and over in blitz, but you just happened to run across a cluster of opponents that are, at that moment, higher rated than you and who played poorly against you.
I have realized that no matter what I do, the only thing that improves me is work. I have to build up my knowledge and my skill so that I can select better moves. None of this will ever happen grinding out blitz games unless one is an exceptionally talented player. I don't know what the frequency of this is - it's probably one in tens of thousands. I have to read, learn, practice, review my games with skilled players, read master games, etc. I have to do it continuously and diligently. Otherwise I don't improve. That's my reality and it's probably yours, too.