Just using the web when the connection stalled and then this appeared on the stats?
Can't say I've ever seen a spike up before? Maybe related to PhyR roll out? Attainable sync went up by 10,000kbps as well.
Also had full packet loss showing during that time on the BQM. Although may be related to this:
BT are apparently doing this between midnight and 6, but I doubt that would have caused loss of sync:
BT is implementing a one-touch project to upgrade MSE, MSC, IEA, EES and EEA devices at (Kirkby Lonsdale, Leigh Collier Lancs, Oxted, Pocklington, Saffron Walden, Wigton, London Covent Garden, London Croydon South, Salisbury Sarem Trunk, Swansea Metro Node). This involves a software upgrade and some hardware changes on the device in a single night under (Program 45 - 7750 Software Upgrade).
I do have a theory, at this time, 00:23 connections on the cab disconnected, and as I reconnected, the amount of crosstalk reduced and then went back up as modems synced back up? I assume the effects of crosstalk are that sudden if all connections were to lose sync.
Obviously, this is only my own theory, however, it seems highly feasible? We also are experiencing an electrical storm at the moment, but that was after this spike.