Okay after giving my cuff another go and popping on my ear securely it fell off in the first 10min and is now lost. I did not jump or move or even nod my head. I was just sitting down and it pinged off. They are quite expensive so it’s a shame they fell off after only the second use and are now lost somewhere. I’ve learnt my lesson, don’t buy the cuffs unless you have a good shape ear for them to sit onto and don’t do anything if/when wearing them.