I have this wireless set of keyboard and mouse called "Logitech cordless freedom". I didn't have any problems regarding this set for over a year, but month ago by cordless devices began acting strange. Every 2 or 3 days (not very often) the cordless devices seem to loose their location. They just stop working. I try pressing those "Connect" buttons but that doesn't help too. After switching mouse to PS/2 and back to USB mouse sometimes start working. But doing this sometimes is a big waste of time. Why does that happen?