Again !

I know I sound like a broken record Tankerbuilder, but it looks like you're hitting the space bar before punctuation marks again.

Hmmm. "Sound like a broken record....I wonder how many people know what that expression means any more.

When was the last time you cleaned the keyboard? It's possible you may have dust and debris in and between your keyboard buttons.

Another possibilty your keyboard may be on its way out (if you're using a desktop PC) Keyboards are fairly cheap to replace. Just a thought...

Both ideas in the two preceding posts are excellent. Weak electrical contacts or dirt between the keys could explain a lot.

I've seen nice new keyboards for about $20.00.

Yup. Disconnect your keyboard, turn it upside down and shake the bejezzus outta of it. You'd be surprised what you'll find coming out between the buttons. Sorry, you won't find money in there. LOL!