Great Mouse short-lived

I have the mouse (then under a different product name, but the same) bought three months ago and was actually very happy. Is nice and flat, is still well in hand, exactly (certainly no gaming mouse but that'd expect no) and working just for daily transport to the laptop perfectly suitable.
Unfortunately, the mouse has now adopted after 3 months. Only the middle mouse button (mouse wheel) responded no longer reliable, now the left mouse button is only occasionally. Thus the mouse is unfortunately useless. I've now ordered something else first, but may well be that I here still fetch me this again. For the price (for me at that time 6.99) is not never done much broken.