Why do I randomly get kicked the first 30 seconds of a competitive game and get suspend automatically for 10 minutes? I check my connection right afterwards and it’ll be fine. Then I lose my endorsement level. I can’t stay at level 4 because of this.
Unfortunately, it sounds like you’re having a connection issue. It could be something in your home, or something on the way to Blizzard’s servers. You might find these steps helpful, and if not, I can look over some WinMTR results for you.
As for the SR penalty and ban, Blizzard covered that here: