Over the past few days the left button on my Logitech VX Nano had been playing up (it’s over 3 years old and has had daily use). This was especially noticeable when dragging, or holding down the button. Instead of staying down it would flicker between down and up quickly. Pressing hard worked to solve the problem but it was getting to be a pain. Before heading to Amazon to buy another, I thought I’d have a go at resurrecting it. I didn’t want to take it to bits, to do so I’d have had to remove the low-friction pads from the bottom, and they’d never go back on quite as well afterwards. Instead, I took a long-haired paintbrush with stiff (hog’s hair) bristles and had a good poke around under the button. This seems to have fixed the problem!