You're right here, I could have sworn I pasted the link...
Except this?
must be closed, not opened empty, this lead to bugs...
The question was why you changed it, versus leaving it at the default, which is NOT my preference, but the default...
And a 30-second timeout is better anyway.
The reason for this is unrelated to the DNS issue, but it improves the other fields. (See also @pe1chl reply...)
Discussing this here would have been off topic...
(v6 20s, v7 30s defaults???)
I don't take anything personally, don't worry.
My attitude is quite annoying, but it certainly doesn't leave anyone indifferent,
and you'll definitely ask yourself a few "why did he write that?" questions, and whether you like it or not, you learn something new...
Like, for example, how to tolerate strange people... 
...or how annoying it is when DETAILS are missing... that's why the first post was made that way ON PURPOSE... 