I have a microsoft wireless keyboard and mouse, and a single receiver for both. The last month or so, when typing there are several keystrokes that never make it to the computer. This results in missed characters when typing, or things like not being able to use the tab key to reliably navigate information fields on internet pages. It seems to grow worse the longer a keyboard is used after sitting down to use it. I changed the batteries and have performed a reconnect of the wireless signal between the keyboard and receiver many times. Everything worked great when I first got the keyboard/mouse combo about two months ago. Not sure what else to do but go back to a wired keyboard. Any ideas?