My SteelSeries Rival 100's middle click started acting up recently. I thought it's a Firefox bug, I usually use my middle click to close tabs and it kept randomly closing two. It seems that if I press the middle button, especially while also moving the cursor around, it registers a double click instead causing that. But it didn't really do anything outside my browser so I didn't notice it until I tested it deliberately. For now I'm bypassing it with setting the middle button in the SteelSeries software to instead of play once, to play N times set to 123ms repeat of 1, which seems to work out so far without usability issues.
The mouse lasted pretty good, I got it just over 5 years ago and it was the cheapest SteelSeries mouse at the time. I liked it because it was like older Logitech mice, no frills with the two thumb buttons I wanted and no weird designs or anything, just the optional RGB lighting on the wheel and logo on its butt. If more buttons degrade and it becomes a problem I'll probably go for another by SteelSeries, again whatever is the cheapest (currently the Rival 3).