JDBC datasource connection logic changed in Wls 10.3.3 & Wls 10.3.6?

Hello All,

    I have a generic DS in WLS 10.3.3 which on any TNS error(Example:- DB not available) will keep throwing a <BEA-001129>  error every 5 seconds.

Now,i have the same DS in WLS 10.3.6,where on such an error scenario,weblogic suspends the datasource after two connection attempt failures(Two <BEA-001129> errors).

I want to know if any change around the datasource connection  logic has occurred between WLS 10.3.3 & WLS 10.3.6?If so,where can i find relevant literature for it.

I have already checked the JDBC feature changes document of 10.3.4,10.3.5 & 10.3.6 releases.But didn't find anything helpful.

Any leads on my query would be very much appreciated.