I've been using Mk 520 wireless keyboards for a while. Very little problems. I recently customized a new computer and also installed Windows 10. The keyboard is sporadic at times as is the mouse. I anticipate it might be the keyboard.
Besides the keystrokes being "delayed" every so often, in outlook, the Shift-Select doesnt work sometimes. I found that if I double click the shift, then double click the control, then double click the windows keys, the functionality returns.
I dont know if these things are related or not (sounds a bit too hocus pocus to me ). Are there any settings someone can think of , or, is there a better Wireless keyboard out there to consider?