restarting bind fixes some resolution issues

[Dario Corti]

Hi, I occasionally have issues updating some packages, with the package 
manager saying that it cannot resolve deb.nodesource.com. I'm using 
1:9.9.5.dfsg-9+deb8u11 and I verified that a bind restart fixes the 
problem every time (even if technically the domain CAN be resolved also 
before the restart).

I issued a dig before and after the restart and it does report something 
different, but I'm unable to understand it, so I wonder if anyone can 
suggest a possible reason for this.

Before: https://pastebin.com/7qZUmPKA
After: https://pastebin.com/U0DUhE20

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dario at dariocorti.com
dcorti at gmail.com
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