Does this problem repeat itself? If the answer is yes, then the problem can be with the site or picture, but if the answer is not, than the problem is lag, which can be caused by burden on provider. Such lags can be met, when the people have FTTC connection. These services use fibre optic wires only from the provider to the green telecommunications cabinets you see on most streets. From the cabinet itself to your home, a copper wire connection is used instead of fibre optic. I have read all this information on usave.co.uk. Hope I have helped you find the reason of problem. Good luck, bro.