Sporadic missing TimeToLive values in SignalR Arrival Predictions

I’m using the SignalR feed from https://push-api.tfl.gov.uk/signalr/hubs/signalr to receive predictions on a number of lines. This evening I’ve noticed a number of the Predictions in my database have missing TimeToLive values and I blamed my own code. However, if I use the SignalR sample JSFiddle the issue occurs there too so I know it’s not a problem my end!

Has anyone else had this issue? Or has anyone from TfL got any insight on the cause of this? It’s causing absolute havoc in my app!

That will be @jamesevans