I have not heard anyone reporting that issue before.

It may seem unlikely, but buttons wear out over time and I've had people with random things similar to that where the button was intermittently sending down/up/down/up (like double tapping) while they were holding the button down; like a loose connection inside the button itself.

It's happened to my mouse a couple times and I have to get a new one and the problem goes away. It would normally be hard to notice, but playing WoW I always use the right button hold to pan the camera (ALL the time!) and I would see the stutter along with other very slight oddities.

So again, it might not be the case, but I'd also have to imagine that other people would be reporting the issue as well if it was a bug in S+. Unless you have some complicated logic/scripts going on which could be attributed to it.

You could try a different mouse if you're able to. Or if you do have a non-standard S+ configuration, try just the default for a while and see if it still happens. Or close S+ and find an app where you can right-click hold and move to see if you are noticing stuttering or odd behavior.

Usually people only use the right button for stationary clicks, or right click drag very rarely, so it's hard to notice a failing button during normal use - a double right-click in a single location won't really present as a problem, it will be so quick it just shows the right click menu.