Hello my name is ***** ***** I will be happy to assist you.
There are a number of reasons this can be happening and also a number of ways to fix the issue. Allow me a moment to type them up for you.
The first thing I suggest you do is hold the keyboard upside down and give a good shake and see if any dust or dirt falls out. Next I suggest you get a can of compressed air and attempt to blow out all dust from under the space bar.
I am going to provide you a guide with some other techniques for repair. Do these at your own risk as it is possible to damage the keyboard while trying to fix if you make a mistake.
Here is the guide: CLICK HERE
In many cases repairing a keyboard is not worth it and you will save yourself a lot of time and frustration by simply buying a new one so that is something to think about as well.
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