Sometimes DNS does not resolv domains

[David Woodfall]

Hi

I am running bind on slackware 14.1 x86_64 for my own websites, but
also as a standard DNS for my other systems to use.

I have my /etc/resolv on my laptop pointing at it. It's always worked
flawlessly until a few months ago, when sometimes a domain would fail
to resolve. Just occasionally.

Today it happened again with amazon.co.uk and I had to point
/etc/resolv at my router to get it to resolve.

Any ideas what might be causing this?

Version: bind-9.9.6_P1-x86_64-1_slack14.1

Thanks