IMPORTANT: We don’t yet know if this is a one off glitch or common to all machines.
This is probably of interest to anyone who has competed or watched competitions since 2005.
In some competitions the La Marzoccos used were GB5 and FB80 AV machines – meaning they have a line of buttons linked to volumetric controls. More recently a lot of machines just had one big on/off button.
Anyway – I remember back in 2005 in Seattle and in other barista competitions that during a competitors set the machines just seemed to switch off. Everyone was very confused how a barista could have done this as you have to push and hold an on/off button for at least 3 (or maybe 5) seconds.