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INVALID_LOGIN for login api call

We are seeing situations where web serivce login api calls are failing with INVALID_LOGIN and then succeeding moments later with no change to the credentails.  These are integrations that have been running with no issues for years.

Has there been a change in the salesforce in the last week that would dramactically increase the INVALID_LOGIN error responses ?
ShashankShashank (Salesforce Developers) 
There hasn't been any such changes. Could you please check the login history of the integration user and let me know what the entry for the invalid login looks like?