With bank-linking technology it is a regulatory requirement that your account must be re-linked every 90 days. This is to protect consumers from linking to something and forgetting about it for years.
We agree that it is a bit painful and regulations may be changing in the future to give you the choice to be linked for longer.
To reconnect, simply navigate to More > Connected Accounts. From here, tap on your bank's name and click 'Renew Access' and follow the steps to reconnect. It takes less than 30 seconds!