Maybe the restaurant manager purposely switch off the WIFI so
customers can't just sit in the restaurant and surf the net without
having any spendings.
Me know some Coffee Bean outlets do that, just to encourage
purchases. The other time me went with my friends discussing some
plans, the WIFI wasn't up running, then my friend went up to the
counter to enquire on the WIFI, the counter crew replied that the
WIFI network was down and if we were purchasing any beverages as
all the sittings in the outlet were reserved for patrons only. My
friend bought four Ultimate Ice Blended, and within five minutes
after we went back to our seats, the WIFI was up.
Hmmm... Very unscruplous way of doing business... 
