For info .... there is a new REIN filter being deployed for the field teams that may help with 3rd party interference ??
We sometimes get customers that have a 'noisy item' but refuse to isolate the equipment, so hopefully this new closure may help as it can be fitted to the dropwire/BT66, that OR own outright.
Unable to elaborate further but I'm sure there'll be other info about this, out there.