The firmware doesn't fix issue entirely. It's better but still problem exist and it's very easy to reproduce by not just clicking left mouse button but clicking and holding down the button, instead of single click it goes click, click, click or it holds single click for a time, release it for 1 sec and hold again. It's frustrating when draging files or folders you can sometimes drop it in the wrong folder and look for it for a while :) It's my second mouse after 1st was RMA after just 1 week after purchase with the same problem. On this one problem appeard after a month. I'm waiting for 1.05 firmware and if this one doesn't help I'm RMA it again. Hope the new revision is also out :(