Our upstream provider has observed some problems with one of their core network devices:
We have observed a short outage on one of our core routers within London. Initial investigations are indicating that this was caused by a line card reboot. The router is currently stable, but under close monitoring. Further investigations are ongoing into the underlying cause.
We are treating this issue as a high priority within our organisation and will keep you updated on the actions being taken.
Our [provider's] investigations have indicated that the line card reboot was triggered by a potential system bug within the traffic flow analysis process. Following this identification, [they] have disabled traffic flow analysis as a temporary measure to ensure system stability. [They] are continuing to monitor the system, but do not expect any further unplanned disruption related to this issue. [Their] engineers are engaging with [their] hardware vendor to confirm a permeant (sic) resolve and will action any highlighted actions within notified planned maintenance windows.