Tips on time-trouble blunders?

Hey guys,

im being really direct now. I love chess and improving stuff, like opening / endgame theorie, tactics etc. Not sure why, but around once in a month my rating drops about 100 rating points and it seems to be very hard for me to catch up again. (Usually I even Improve a little bit, after I get out of those "dark periods")

So I was trying to figure out my main-weakness, and IMO it's just calculating and blitzing out moves under hard time pressure. At least I think it is, because in most of my games I like the way the game starts, I'm confident in the opening and middlegame and in 80% im simply winning. But in the end I miss a tactic or simply hang stuff under timepressure, its just ridiculous. Here are some good and bad games, so you'll see me blundering around and Im thankful for any good advice from experienced players who can tell me what i can do about it.

Everybody blunders under time pressure, even titled players.