Home Purchase Closing Dates Always Changing

I'm a newer agent and I'm not sure if there's a "best practice" way to alleviate this. Recently I have been spinning my wheels because new home buyer's closing dates keep changing. I always ask for a firm closing date before binding but of course they always change. Is there a better way to deal with this?

BTW some of my carriers change bind date by quick endorsement change. But some of them are complete re-writes.

Thanks in advance

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