I notice this when a player only plays a single slot throughout his gambling session.  I can't call it rigged since there is no proof about it and I can't support such statement with strong evidence, and I incline to think that it is designed as that.

So I believe to avoid this kind of experience, we should not stay too long in one game, make use of the variety of slot games available on the platform and compare the results.  I personally have a good result using this kind of method but I do not know if it will work for you.