How often should "ReorganizeChain" staking situations happen?

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self.gridcoin
It seems for me in the last six months, that I'll get a notification of an incoming transaction, only to look and see nothing. In the debug log, all of these involve a "Reorganizechain" event. Another happened late last night, particularly disappointing as the reward seemed unusually high (said 622, expected 42 or the like). If I were to guess, this has happened a half dozen times, having otherwise successfully staked around 20 times this year. I just wanted to make sure I wasn't messing anything up on my end.