Keil Studio Cloud keeps loosing connection

Today the connection to https://studio.keil.arm.com is very unstable. It keeps disconnecting after few seconds (browser shows 'offline' mode). Reloading the page when it gets to offline mode displays the following error message:

upstream connect error or disconnect/reset before headers. reset reason: connection failure

Any idea why this is happening ?
Is there a site where the status of Keil Studio Cloud is announced ?