I originally posted in another thread that I came across from Google that seemed recently active, but it looks like this thread is more active so thought best to post here.
I am experiencing the same issues with my M65 Elite. I purchased it from Amazon UK on 12/08, it's now 14/10 so we're talking as near as makes no difference two months old. The problem has existed for at least a week, if not two, now so we're talking a month and a half to develop the fault. That's horrendous.
I agree that it's a hardware problem. For my particular setup, I have my personal gaming PC running Windows 10 & iCUE along with my Lenovo work laptop that is running Windows 10 without iCUE. Corporate policy means I cannot, nor do I have any desire to, install iCUE on this machine. I have no need for customisations on my work laptop as I'm just using it as a basic mouse here.
The fault exists on *both* machines, so I think that can rule out iCUE causing any problems and potentially any driver issues. Also should cut out any OS issues being two different machines. Both running Windows 10, but different versions. Work machine is on 1809. Personal machine is on whatever the latest and greatest is. 20H2? 2009? Something like that.
A great post by SteemSucker about how to replace the microswitches. It sounds like this is spot on the money for where the problem lies. Unfortunately I don't have enough faith in my soldering skills to even consider giving this a try... but also on principal, why should I have to do this? I've already paid good money for the mouse in the first place, it would be nice if it worked in the first place. It seems this is a known and fairly well documented issue, yet there doesn't appear to be any official acknowledgement from Corsair.
Also interesting to see regarding the China vs. Taiwan manufacturing differences. I have checked the label on mine and it is a made in China model.
I'm currently considering which option I want to take... send an RMA through and get another device sent through which will inevitably have the same defect as it seems they all do.... or request a refund from Amazon UK and use that money to purchase a similar mouse from a different brand.
I like the design and general feel of this mouse so I'm a little reluctant to return it and purhcase a different brand, but I don't know if I have much choice if I'm going to end up RMA'ing the device every 2-3 months.
Edit And a new, really useful feature just happened... It just locked up completely. RGB lights still happily flickering away, but no responsiveness at all. Disconnect and reconnected fixed it, but I seem to remember reading another poor customer in this thread who had the same experience. Hopefully this is less common than the left click issue.....