At approximately 08:45 we became aware via internal system monitoring that there were some system performance issues that were preventing some customers from logging in. We decided to immediately restart some of our back end services to alleviate the issue whilst we investigate further. This restart process initially cleared the issue and some customers returned to normal service as of 09:10 GMT. However following on from that we did see a pattern of slow responses for some customers that we have experienced two or three times over the last month. Each time the system recovered itself fairly quickly however this time we made some additional infrastructure changes to help alleviate the issue and this brought the system back to normal performance extremely quickly. Normal service returned fully for all customers as of approximately 09:50am. During this process, logging in using the web was impacted however Room Signage and Kiosks apps continued to work as did email, API access and Office 365 integrations. We will provide further detail on this issue once the investigation in to root cause has been fully completed.