I can't switch between screens in Windows 10

I use Alt+Tab to switch between screens. Sometimes, it won't work and I will re-start my computer and I may have to do that multiple times before it works normally. I do notice that when it isn't working, I can't use the taskbar either to switch between screens (programs). I currently have Chrome and Open Office open. If both are maximized, then it won't switch. If one is minimized, and I click on it, it will open on my screen. But once it is maximized, I can't go between them unless I minimize first.

Any ideas what the issue might be?

Thanks

I wonder if I am stating the issue incorrectly in my verbiage. I use alt+tab to bring the window I want to see up. So, if I have multiple windows, or programs going, and I want to go from one to the other, I can see those in my task bar. I can select it, but it will not come up on my screen. Only if I minimize the window I have up can I then see the other window. I usually utilize alt+tab to go from window to window but it isn't working. I am noticing that when alt+tab does not work, I cannot open another window from the task bar either. Let me know if you get the issue from this description. I am on a laptop and only have one screen. Thank you

I had to re-start my laptop about 10 times but now it is finally working. Phew. Usually, it takes a restart or two not 10. This only happens after a restart. It either works or it doesn't. When it doesn't, I restart until it does. I really have no idea why this happens.