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This can mean that the spacebar is not being tapped hard enough, the spacebar is sticky, the escapement is sticky, or the spacebar linkage needs adjusted. If the letters do not cause this, then the escapement being sticky is less of a concern. Sometimes the touch on the spacebar is right on the point where the escapement mechanism just barely escapes and doesn't lock in. First try tapping the spacebar more firmly to see if this helps.
There is a rubber part that is designed to spring up when you release the space bar - this is the contacts that is the electrical push button. At each end the metal bar is hooked to the plastic (the long space bar key). There may be a couple springs found as well - they should seat on the base. Connect all pieces and place the space bar key over the area where it aligns to the keyboard and snap it place with a slight force.
The spacebar is the most often used switch on your keyboard, so, yes, it's from overuse, but also from the fact that it is the longest key on your keyboard and the closest to the edge, all of this combining to make it the dirtiest key on the board.
So, get a keyboard cleaning kit, either professional or DIY which would consist of the following, cotton swabs, compressed air, and maybe a toothbrush and realize that all the stuff that accumulates under your keyboard's space key makes it harder to depress to the point where contact is made.
i have already posted the solution to my problem.....but i will tell you in more specifics what transpired.........after removing my spacebar.....i used electric pre-shave (an alcohol based solutions with a slight amount of lubrication).......with a few drops of that and a q-tip i cleaned the black tarry mass that had accumulated underneath the space bar most likely from spilled pop,coffee,pancake syrup,cat hairs,and only god knows what else...........after replacing it it worked fine mechanically and physically but did not work on the screen......after a day or two it started working .....i guess the alcohol needed to dry out .....i did put two drops down the tube that had a pad at the bottom (contacts underneath it ).........everything working better than new now .......thanks for being here to help.........
Have you tried applying pressure gently until it snaps back in place? That could be the issue, is that the spacebar unsnapped itself when you were cleaning it. If you were using compressed air (canned air) then you may have blown something underneath it and it jammed itself in there. Trying turning the keyboard upside down and gently tapping it on a hard surface to see if anything else comes out.