It sounds more like you've a dirty jack connection on your microphone.

When you insert the mic plug, twist it back and forth a few times to give it a clean - every time you plug it in.

The microphone is an electret, and needs a small voltage to make it work, you see. The pops are from the electrical connection making or breaking, and the blanks spots are when the connection has broken...

If it's an ongoing problem, try gently spraying the plug with WD40, then plug it in and give it a few twists.

Jack plugs (especially the mini-type) have a very small contact area, so microscopic amounts of dirt can be quite drastic!