I use a Streamdeck XL for some functions, and recently noticed some input lag, and duplicate inputs being sent to the sim, almost like key bounce.
The first time I noticed this was when pressing the key that brings up the ATC window. It would appear then disappear. Of if I opened it via the keyboard, it would disappear then reappear if using the Streamdeck to close it.
I have since identified what I think is a bug with how the ATC window is being displayed, which is a separate issue, but it is made worse by this kind of input lag.
I also notice it when trying to do simple things like press the button that enables the parking brakes. For me this is CTRL+NUM DECIMAL.
This works perfectly when I use my keyboard to do this, but when I use the Streamdeck the input will often either be ignored, or will happen a second or so later.
The upshot of this is it has made the Streamdeck all but useless now.
Earlier this weekend I had an instance where it would disconnect sometimes when pressing any of its buttons, which would then cause the sim to crash sometimes due to the USB disconnect bug, but a firmware update seems to have fixed that particular issue.