Avast! Inteferes With USB Keyboard/Mouse

So Iv tested this as I kept somehow inserting wrong passwords. I CONSTANTLY have to go back a check for missing characters of a sentence; include this one(see screenshot of sentence before checking).

I changed K/M with no effect.

I uninstalled Avast! and problems stopped.

In my belief, Avast! is trying to scan the device as 'Removeable Media" but only have my testing to leave this as the conclusion.

Why does this product seem to be going down hill at EVERY turn???