Apologies for the short notice, however if we can we need to find what the cause was.
Once we have completed our tests we will post a further update.
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Following on from the tests a switch at TCW, which is part of a pair, has been identified as the most probable cause for the issues and instabilities. As the issue is somewhat intermittent I'm reluctant to pull the switch while it's under load from directly connected clients - the quietest time across all the ports is around 7am, so, we will look to swap the unit out then on Thursday 21st.. Directly connected clients and those using services connected to this switch will drop for a few minutes while the switch is replaced.
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The work is now complete - the suspect switch will be taken back for further tests in the lab, further updates will be posted here.