left mouse button does not work (sometimes)

hello,

the left mouse button of my Logitech G5 refresh does NOT work properly sometimes...i don't know if i can do anything about it, but maybe you know a solution...

for example:
when i am ingame and try to shoot, it works for a few bullets, then not, then again some bullets, then not... it's weird and freaky... makes me wanna throw that piece of shitmouse onto the next wall anytime it happens...

picture of the mouse

thanks