Why does Intuit log into my bank accounts every night ~midnight?

Question

Turned on login notifications for several bank accounts.  Started getting daily notifications of a login ~midnight local time from IP addresses 206.108.41.101 through 8.  IP location indicates the ISP is Intuit, with a secondary association with Amazon.  Concerns are:
 - What is the rationale for this behavior?
 - Is this happening with all of my accounts?
 - Is it Intuit or Amazon?  One account has NO Amazon association, so my suspicion is Intuit.
 - If my login info changes or is incorrect, some accounts will lock me out with several login failures.
 Hopefully someone out there has actual knowledge about this behavior.
 TIA

Wes@ · Answer

No, I do not have synch enabled.
 I specifically want to manage my accounts locally and do not want the account data stored online.

Ps56k2 · Answer

also - do you have SYNC enabled -

for Quicken Cloud supporting the Mobile App and Quicken on the Web -

Wes@ · Answer

Thank you very much; I believe that is the information I am looking for.  I will review my accounts and see what type of connections I use and how it corresponds to the notifications.  Appreciate the quick response and direction to useful information!