Checking account never balances
I download bank information from my checking account at least 3 or 4 times a week and reconcile the accounts when downloaded. Recently, each download and reconciliation results in a balance adjustment ranging from a few hundred to a few thousand dollars. The resulting balance is way off what is shown in my bank's records. Aside from manually reconciling this year's transactions (I've got over 20 years of transactions on the account), How do I fix? What might be causing this?