Shift key registers even though I am not holding it down in Adobe Animate 2019 and 2020 (Windows 10)

Hi everyone.  First, a refresher on shortcuts:

• go one frame back:  comma 
• go one frame forward: period 
• jump to the start of timeline:  shift + comma
• jump to the end of the timeline:  shift + period

Anyways my issue is that oftentimes, when I press comma or period to navigate the timeline, instead of it moving one frame, instead it will sometimes jump to the beginning/end of the timeline, as if I was holding down shift while I press comma/period.  However, I am not holding down shift!  I know for sure that it thinks shift is active because when I try to use the brush tool, it makes straight lines, and when I try to select a frame, it selects multiple frames. 

When I am in this predicament, I have to press random keys in order to make shift unstuck.  Things will work normal for a minute (when i press comma or period, ir moves one frame like it should), but soon, it thinks shift is being held down again, and I have to unstuck it by pressing random keys.  This is VERY annoying.  Does anyone know of a solution to this?  I would appreciate it!

There could be a lot of factors than influenced this problem. I:

• upgraded from windows 7 to windows 10
• updated my adobe animate software.  I am using the same file from the older version of adobe animate. 

OS:  Windows 10 64bit

Tablet:  XP-Pen Artist 22E

Software:  Adobe Animate 2019 and 2020 (issue happens on both)