There have been several threads this year about this situation.For some people it went back to normal in a day or two.
In my case I was convinced Orange had altered some settings somewhere but of course they denied it had anything to do with them.
A local engineer couldn't find anything wrong but then got three other calls about the same problem.
He eventually looked at an Orangeproblems site and someone there suggested dowloading something called Tweakmaster which fixed the problem.