Historical transaction disappears, leaving balance that does not match bank

I spent way too much time figuring out that Quicken lost a transfer transaction from my checking to my visa account. Thankfully I found it in a prior backup file. This transaction was from 2010 that just disappeared from my .QDF file. I ran a validation on the file that had the missing transaction, it came back clean. This is a hit to my confidence in the application. Anyone else have something like this happen recently?
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