I'd be surprised if it's anything new near the cabinets, as for some reason the cabinets are located in the middle of an overgrown common. They're at least 100 metres from any properties, the A1M is closer! When we had FTTC installed we had a BT engineer visit from out of the local area, and he couldn't find the cabinets as the comon ground gets so overgrown you can't actually see the cabinets at all.
The only things that's changed locally for me is the installation of the smart meter (Secure Liberty 100), but as I wasn't monitoring the line before they were installed it's difficult to blame that at this point. We've also started using an old Motorola MBP-18 Video Baby Monitor, I don't know if they can cause issues.