Losing Streak

Is there any reason that many players - including me -, got losing streaks? If i check my opponents, sometimes they have losing streaks, too and of course they win if they play against me in a brutal way (strong, sharp, fast) that I clearly dont know understand how they have losing streaks with normal long games of 30+ moves. 

It´s so frustrating. Sometimes it seems that the system regardless of the site (either lichess or chesscom) push u down in a forcing way. Why it dont let u stay in ur ranking?

Even masters like Nelson (YT) lose nearly 200 points in rapid with their regular account. Im talking about myself "only" about +/-50 points, but in the past it was a range about 600 points and I really dont wanna make this experience again. Because thats a absurd way.

In the past, even support said it´s a rollercoaster what my ex-account did multiple times and I got higher again a bit faster the before. So that´s it? Losing "by force" so u can climb up again - and again - and again? Is that about matchmaking? 

So what´s going on in online chess?

Oh, before I forget: I analyze my games afterwards.

Streaks are a statistical certainty in any competitive system. If you flip a fair coin 100 times, you will absolutely get streaks like:

* 4–5 heads in a row
* 6–8 tails in a row