hi i have a bt hub 4,over the past 4 days i keep losing the signal(the hub keeps turning orange)this has happened over 10 times i phoned bt they say my broadband is fine with no fault,my phone is working fine/anyone any ideas about what is happening, i have bt infinity.

Looking at the BThelp site your hub maybe going into power save mode
http://bt.custhelp.com/app/answers/detail/a_id/11353

Here is a link telling you how to set it
http://bt.custhelp.com/app/answers/d....0-or-hub-3%3F

Could it be an issue with the Openreach modem?

Try a filter plugged into the test socket if you remove the faceplate

Are you sure you've called BT? They would normally advise CPE checks if the line is testing fine, in which case you'd know exactly what to do.