BBC Radio phone dropouts

[rupert the dog]

I've noticed that recently there seems to be a high frequency of phone lines going down in the middle of various BBC Radio programmes. I mainly listen to Radio 5 Live, so that's where I find it very noticeable, almost every programme will at some stage suffer from a "....and we appear to have lost contact with Sid, and we'll try to get back to him as soon as we can..." moment (or moments). I can't be sure but I do think the frequency has increased since they moved to t'North. Anyone else noticed, or know of any reason for it?