The website to test your mouse button is: Here is a video of the clicking issues in action. I just noticed today that the left mouse button is doing a few double clicks. This is occurring intermittently for the past 5 months on my right mouse button. The G604 definitely has multiple click issues, both slow and fast. im happy now with my g502 + better and new switches, everything works fine. Other then that, if you look for another brand i can't really help you. so if you get logitech again and don't solder new switches in it, don't expect the new one to work for a long time. Have been through 30 g502 RMAs and this subreddit is full with those kind of problems, with every kind of mouse. If you want to use logitech without double clicks/drag and drop bug, then you have to solder new switches into your mouse, like for example kailh red gm 4.0 switches. for example i didn't noticed it on my g502, i just noticed it after many months playing wow, when the right click wasn't holding (drag and drop bug) If people think they don't have a problem like this with their mice, then they got really really lucky or just don't notice it. cheap omron switches, which weren't made to be run at low voltage and so they have to break, at best right after 2 years. Have seen enough double click posts in here for the g604, so my guess it's like with pretty every other logitech mouse.
