CTRL, ALT and SHIFT keys are sticking (not physically)

I am having a problem with the T-61p I have been using for 2 years now.
About once every 2 days Windows thinks that either the CTRL, the ALT or the SHIFT key is held down.  I only notice this when my mouse's left click or my arrow keys starts behaving funny (like opening dialogs when clicking on icons or highlighting text on a page in MS Word) instead of moving the cursor as they should.
When this starts happening, pressing the CTRL, ALT and SHIFT buttons causes the strange behavior to stop.
None of the keys are physically stuck down.  I am using an external keyboard with my laptop closed and docked.  I have tried switching keyboards, and I get the same results with brand new Logitech keyboards.
What could this be?  Has anyone seen this problem before?
Your help is much appreciated.

Welcome to the forum!
It sounds like you've inadvertently turned on the Sticky Keys accessibility feature.  Since you didn't mention which operating system you're using, I can't tell you how to turn it off.  Trying searching for Sticky Keys in Help in the Start button menu.
Hope this helps!
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Jane
2015 X1 Carbon, ThinkPad Slate, T410s, X301, X200 Tablet, T60p, HP TouchPad, iPad Air 2, iPhone 5S, IdeaTab A2107A, Yoga Tablet, Yoga 3 Pro
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