With respect @iniltous, BT's own online test is now identifying the stale PPP session fault on an almost daily basis (enclosed) and it has been witnessed by Customer Support Guides, during numerous telephone conversations. I would reiterate that VOL053-8502009814494, is the 85th recorded fault with my service, since upgrading to Full Fibre and politely point out, that it is the BT guides, who have scheduled the 15 visits by either a BT or an Openreach engineer. For your information and although it is rare, the red LOS light has come on briefly, but more often than not, it is a flashing green PON light, that is shown upon the ONT. Correct me if I am wrong, but doesn't this confirm that my problem with the incoming light signal is external. Therefore and from my humble perspective, as it has now been ongoing for some time and as every other item of equipment has been exchanged on numerous occasions, I simply believe that the cable should be replaced, if only to eliminate it as the cause of the issue.
@iniltous For your info, my 1 bed bungalow had been completely refurbished prior to upgrading to Full Fibre 900, which obviously included complete rewiring. Initially, as for the first 6 months the issue was continually being diagnosed as being internal, it resulted in numerous visits from BT engineers. As a result, the Hub was relocated on several occasions and each time, the internal cabling was replaced and every item of equipment was disconnected, so as to eliminate it from their investigation. I was even persuaded to upgrade to "Halo" but incredulously, my internal speeds were significantly reduced, when the mini discs were installed.
In the meantime, the drops in signal have now been ongoing for over 3 years, but it is only recently, that I have witnessed either a red LOS light, or a flashing green PON light, upon my ONT. More to the point, I would reiterate that the Stale PPP session fault, which was first diagnosed in November 2023, has now been reported on an almost a daily basis, since October 2025.
Going forward and according to my own online research, a flashing green PON light indicates that my ONT is attempting to establish connection with BT's headend, but cannot complete the handshake. The recent visit from an Openreach engineer has ruled out authentication failure and established that the fibre connectors are clean. However, he was dismissive of my claims that the cable itself could be at fault, despite this having been identified as a possible contributing factor. He implied that the signal loss could be being caused by a fault with the port at the Optical Line Terminal at the local exchange and stated that he had arranged to have the connection monitored. However and although it continues, as of today, the fault has again been closed.
