Laptop sometimes pick up sound

I have an Alienware laptop that is about 2-3 years old and I use a steel series headset that is probably 5 years old. I haven’t had any problems with either love them both but recently I am having issues where my microphone is only sometimes picking up my voice. I did all the test and it says everything is working fine but when I talk to people they can only hear like half of what I say! Any ideas what the problem can be?
 
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