If it's That new....
Try cleaning it (I find compressed air works best)
Logitech stuff is usually pretty reliable and again "If it's that new" it's possible it's a foreign material issue...
And while I say "Logitech stuff is usually good" (I'll voluntarily buy and use nothing else)
Yes, DO try another mouse.
But typically an OS problem would make the mouse cursor speed change, as OS issues
have no effect on the sensitivity of the button switches.
(double click interval yes, single click finger pressure? No)
That's why I suspect you have a mechanical issue.
an intermittent switch (internal problem in the switch itself) can artificially create a double click
even when your finger doesn't make a double click
that would cause a link to open... then close.
a much more common fault is the mouse making a "click" (mechanically)
and failing to make the electrical connection,
which specific model wired mouse?
I personally use a tracman wheel mouse (the wired kind because if it's attached to a wire I can find it on my incredibly messy desk)