I get the problem with Both IE (11) and FF. I run Win 7 Enterprise. I started noticing it about 6 months ago, but it could have been happening for longer. I only get about 1.3mb speed as we are down the end of a long country lane, but BBC iPlayer works fine which implies, at least to me, that is not the problem. The strange thing about YouTube is that the buffer bar moves well ahead of the play position, and then just stops so when the play position catches up everything stops. Eventually (after maybe a minute or more) it will restart. In other words its more or less unwatchable. ISP is Orange/EE. Any suggestions would be most welcome!