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Salesforce Failure

Hi Support,
Some times we are getting the following exceptions when insert/update leads in salesforce. But not every time. We are using valid credentials and security tokens.

1. INVALID_LOGIN: Invalid username, password, security token; or user locked out.
2. SERVER_UNAVAILABLE: Too many requests waiting for connections to Standard_Data_Source_1(DataSourceDetailsTemplateConfig)1, Num waiting=36, Thread=/services/Soap%2Fc%2F20.0%2F0DFA0000000GzCP, Current url=/services/Soap%2Fc%2F20.0%2F0DFA0000000GzCP
3. The remote name could not be resolved: 'na10.salesforce.com'
4.Character reference "" is an invalid XML character.

We have created a case regarding this. 
We got response like "I have escalated your case to our Developer team for processing." . But we are not get any response yet. Can you please let me know the root cause for the issue and how to fix the issue?
any update on this issue ?
we are also having the same issue.