never noticed anything like that. some sessions are good/some bad.
For actual reference you should check some PT or HEM stats, they wont lie =)
If I may. A thought:
Maybe you just feel like this beacuse you just got something good ($$$) and now you feel like there is something bad is BOUND to happen, os every time you are run over by a top pair or a bad call from a fishy player you think to yourself that now poker room is trying to get their money back. ?