This is what I just did and it worked.  Try at your own risk.
First, make a back up of your QB.
Then write down each account number you have with TD and the name you have given it.
Go to: Lists/charts of accounts.
Scroll sown and look for your account names with TD, then to the right, look to see if there is a thunderbolt symbol next to the type column.
Right click on the account line and click on edit account.
Click on bank feed settings tab.
Then click on Deactivate all online services. Save and close.
Do this for each account with TD that has the thunderbolt.
Then go back to this page and confirm that thunderbolt is no longer there for each account.
Now click on Banking tab on top of home page screen/Bank Feeds/Set up bank feed for an account.
Go through set up for online accounts with TD new.
Make sure to know your login name and password.
Good luck.