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When you have a single or multiple large blocks and send a transaction mid stake accrual what this does is reset the staking process for those large blocks. As the max stage age is 23 days, it will not start to stake the block for another 23 days.

A workaround maybe to send the coins to another wallet to stake and then return afterwards (I am going to try this with the premine to see what happens).

Any new coins added to your wallet will stake in 23 hours and should only create a stake once every 23 days (transferring coins may not work in creating any duplicate stakes in that period).

The sending coins will obviously only affect the blocks that coins are sent from so the rest should stake ok, but if you have one or two large blocks and send coins then this will reset the staking of those large blocks.

Hope that clears it up. Best thing to do obviously is keep mining and any new blocks will accrue stake.