Reconciled transactions from 2 years ago suddenly unreconciled

Longtime quicken user currently using Quicken premiere 2019. I have a new tremendously annoying problem. Old reconciled credit card transactions (from one particular vendor where I frequently use my card) have suddenly become unreconciled. I've tried reconciling these transactions again, but to no avail. I close and reopen quicken and they have reverted to being unreconciled. I've seen threads about this but no resolution. There are about 20 transactions that date back to 2017. Can someone please help with this. I've tried re-entering (cut and paste) the transactions and changing the vendor name slightly. Unsuccessful.


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