When My Computer Turns on I Have to Unplug My Keyboard and Plug It Back in in Order for It to Work
Help! My Shift key is stuck!
Have you ever gotten so frustrated with your computer that you just start randomly pounding on the keyboard… or perhaps a particular key?
Yeah, me too.
That is often the source of the problem. No, Windows isn't "getting even" with you, though it might seem that way. It thinks you've asked it to do something.
Sticky Keys, Filter Keys, and Toggle Keys are Windows features that modify keyboard behavior. They all have corresponding shortcut sequences to turn on — which can be done accidentally. You can disable this possibility by changing the corresponding "Allow the shortcut key" options in the Settings app.
Windows ease of access
Several of those options relate to the keyboard, and are fairly easily enabled.
Perhaps too easily. 
For example, hitting the Shift key five times in a row.
Sticky Keys
Sticky Keys is a feature that makes the Shift, Alt, Ctrl, and Windows keys toggle instead of needing to be held down. Press and release the Shift key, and Shift is on. Press and release it again, Shift is off. It can seem like it's "stuck" if you don't realize what's happening.
Sticky Keys is enabled in two ways: in the settings app, or by pressing and releasing the Shift key five times in a row.
Let's say you're frustrated with your computer and start hitting the Shift key (or in my case, alternately pounding on both Shift keys). When the Shift key is pressed five times in a row, Windows assumes you're asking for Sticky Keys. Windows does present a confirmation dialog, but that's easy to miss if you're still pounding your keys and happen to hit Return.
Filter Keys & Toggle Keys
Maybe you're not that violent. Perhaps you're just lost in thought as your finger slowly descends on the Shift key. Eight seconds later, Windows thinks you've asked for something called "Filter Keys". Filter Keys is a way to ignore brief or accidentally-repeated keystrokes.
If you've held down the Num Lock key for five seconds, Windows will ask you about something called "Toggle Keys", which beeps a tone whenever you press Caps Lock, Scroll Lock, or Num Lock.
To be fair, Windows does ask before turning on these features, but if you hit Return by mistake and the feature gets turned on, it can be frustrating to try to get anything done if you don't realize what happened.
Which, of course, can lead to more keyboard-pounding.
Ease of access settings
The good news is, these features are easy to turn off. It's also easy to turn off the detection that got you into trouble in the first place.
In the Settings app, search for "ease of access" and click on Ease of Access keyboard settings when it appears. (In prior versions of Windows, look in Control Panel, Accessibility Options).
Here you can turn off (or on, if you like) each of the three features: Sticky Keys, Toggle Keys, and Filter keys.
More importantly, though, each feature has a corresponding checkbox (checked by default), controlling whether or not the corresponding shortcut key sequence is enabled.
Uncheck "Allow the shortcut key to start Sticky Keys" setting, and you can pound the Shift key all you like without effect.
At least until the keyboard breaks.
Podcast audio
When My Computer Turns on I Have to Unplug My Keyboard and Plug It Back in in Order for It to Work
Source: https://askleo.com/shift-key-stuck/