Randomly get 'code:net' and 'code:leaf' in ranked matches

I’ve quit the game so many times because of this issue, losing so much RP due to this stupid problem. Every time I’m having a good match, out of nowhere a 'code:net' or 'code:leaf' error pops up, and I can't even rejoin afterward. I’ve been having this problem for years and I just can't stand it anymore. It’s so frustrating to see my hard-earned points vanish because of a random error. Is anyone else experiencing this? Is there any permanent fix?