I do have a dashcam hard wired. No bulb swaps. Could this be it? Dashcam wire playing havoc with the reception? Maybe I'll remove it and see if the problem remains.
The last couple of days I found another spot where it's started to drop, where it didn't before. It's getting worse!
It doesn't happen with 1 Xtra which I believe is broadcast from the same building and that is flawless, so it's not a signal strength thing, I don't think.
EDIT: I should add I've had the dashcam fitted for probably 3 years now, and the radio has only been iffy for <1 year