The issues may be due to the recent hot weather. There have been reports of cabinets overheating and causing problems.
Your thread heading indicates broadband problems, however have you had any issues with your actual internet?
I see you have 360 box so the live TV signals wouldn't be affected by the internet as live TV is carried over the cabling and not the internet.
I suggest checking all of your cabling. Make sure that it's free of any kinks and also firmly attached to all devices. The white cabling also has some metal connectors which can work free so make sure they are all tightened by turning the metal parts in a clockwise direction.
I realise you say that VM report an "Intermittent Signal" but have been doing so for several days now, so I guess you've used the /check-services/ function to check for problems in your area. You can also a run a test on your equipment from there.
Have you also tried the automated Service Status number 0800 561 0061. This often gives details of more local issues down to postcode level and an estimated fix time.
