Sand bagging

Is sand bagging ethical or not. I have two recent game where my opponent lose on purpose.

I think it is a bait at the end.

These two recent games played are not real wins but sand bagging cases where they lose on purpose.

Does anyone has a solution to this sand bagging problem. 

Try reporting them.  It's considered cheating here and membership can be suspended or terminated.

https://support.chess.com/article/208-what-is-a-sandbagger

yes, i already reported maybe blocked them(can't remember all of them though)

How do you know your opponent lost on purpose? Maybe he was just inept.

I see it all the time. Tournaments being won by players with  an extremely low rating, 600 - 700. Then when you look their game history you will see they lowered their rating pre-tournament by resigning a bunch of games after one or two moves.

OK. I've lost games in fewer than 10 moves, but that's due to incompetence, not sandbagging.

I am not referring to losing a game in a few moves because of incompetence or, but to losing 15 games in a row after just one or two moves. I have noticed (and reported) multiple players last week who had game histories just like that, losing  long streaks of games after just a single move, followed by winning tournaments with a perfect score (presumably because low rated players get matched with other low-rated players).

I've been accused of sandbagging, but I'm innocent. How do you counter these allegations?

If it's an automated message it's likely due to your recent rating drop in rapid.