I have the same exact issue with one bank account and have spent hours trying to fix it with all the recommended things suggested above as well. When i spoke to support their main focus was to upsell me, with the obvious fix to pay Intuit more money and upgrade to the program they want you to buy....However, the account that doesn't connect anymore i reconnected with a new account name and made it a subaccount of the "problem account" and all the transactions show up in the bank register, so it is an OK workaround for now. Today I may pony up and buy the new program i don't want because every few weeks it is some other issue that kills half a day of time and fills it with frustration. The alternative programs appear to be even worse than QB, so I will continue suffering with this one...
