YES. Same happened. If you mean the valve was completely loose because there was no nut to hold it in place, I've posted here before to say this happened and of course the tyre goes completely flat because the valve drops into tyre when you're riding. The nut split, of its own accord, and disappeared. Valve stem also splits around circumference and gives a slow leak. They may be light, but these are rubbish parts for a motorbike, especialy a heavy V.11. Replace with stainless steel.