Happens to me all the time, but I live in rural NZ with Internet speeds that make it preferable to use two coconut shells connected by string, this week I'm in the Big Metropolis ( Auckland ) with Internet speeds that make me very jealous, and it hasn't happened once, and it doesn't happen when I visit L.A.
Got to be a clue there somewhere ?
Stephen Fry, the UK TV presenter was here two months ago, and complained bitterly about the speed and quality of NZ Internet, so our darling NZ Telecom gave him a special connection to shut him up - but they don't give it to those of us who pay their wages ! Grrrr !!