Have you experienced a similar issue? What's your strategy?
Perhaps what happened to me is because I don't use normal spins anymore, mainly only bonus buy. I can see why this feature is banned in some countries.
It is obvious that you should change strategy and not be obsessed with buying the bonus feature or at least not overdo it,just try it once if it gives you good results try one more time and if good results happen again,try one more time,do so until you get bad results and the first time you get bad results stop buying the bonus feature,it is a clear indication that you are going to burn money this way,the game is notifying you .
I still keep playing the same slot but I am becoming better and better at controlling myself,although the big over 1000 multipliers looks gone forever for me I manage to get the bonus round and win a bit of money,immediately stop after getting the bonus round and winning something,and I be back next week,so far is working for me.