Temporarily unreachable

Temporarily unreachable in Google Webmaster Tools

[apnits]

I am not new to google webmaster tools, but this time i am facing a new type of problem whenver i try to use "Fetch As Google" sometimes it shows "Temporarily unreachable", How ever website is up and working.
What could be the problem. should i change the hosting service?

[edited by: engine at 4:28 pm (utc) on Dec 29, 2014]
[edit reason] See WebmasterWorld TOS [/edit]

[lucy24]

apnits, here is your one-size-fits-all answer to any question involving Weird Stuff reported in wmt:

Wait a few days and see if the problem has gone away.