Banks periodically require you to log in again (for example after a password change or a security policy update). When Plaid reports this specific problem (a login-required error), Sprwt flags the connection, pauses syncing and shows an orange Re-authenticate button on the institution card plus the banner Sync is paused for some accounts until you refresh your connection! (also on the dashboard). Click Re-authenticate, complete the Plaid login window, and Sprwt refreshes the connection, clears the error and resumes syncing from where it left off; no transactions are re-imported. In the current version, other kinds of sync errors also stop the background sync for that account, but they don't trigger the Re-authenticate button or the paused-sync banner — those are shown only for the login-required case — so contact support if an account seems to have stopped syncing without that button appearing.