Variations in the quality of the keys

As an old "Logitech" fan I bought this mouse on Jan 2012 Design.
After initial function and reliable use, I realized again,
that a single click triggered a Doppelklich.

So I wanted to move a window (I'm working with multiple monitors)
was maximized the window repeatedly.

So returning to Amazon and credit. Today I order the same again, because I hope
that the error in the inferior key switches is resolved.

So far, I always had good experiences with Logitech and hope they are your good name meet and stay.

Greetings from Dessau