Was using it this morning and noticed the small On/Off button had 'sunk' into the case a bit. Strange.
Went to use it this afternoon and when I pushed the button to turn it on, the button disappeared into the casing
Got home, prized it all apart. The micro switch has come away from the main circuit board
Luckily for me, I've managed to solder the switch back in place.
After a bit of mucking about with some flat ribbon connectors and tiny clips, I've managed to get it working again.
Blows on finger tips and rubs chest