I update my accounts every couple days. Yesterday, I noticed the update was taking an excessively long time to complete. While it was going on, it started asking me questions about transfers from an account I closed out in 2023. When it was finished, the balances for several of my accounts were egregiously overstated. I found that many account transactions for a bank account that has been operational for years had changed to 'Unspecified Account', in some accounts the opening balances were triplicated, in some accounts, transactions from 2023, 2024 and 2025 were changed from reconciled back to 'cleared'. I tried to 'fix' the account by reconciling and doing balance corrections, but it didn't impact the actual balances.
I eventually restored to last weeks backup, reran the update and everything went fine. What caused Quicken to freak out like this?? I use this software everyday for 15 years and have never had this happen!