I have a Logitech® Wireless Wave (Combo MK550) Keyboard/Mouse. I've only had it about 6 months and have never had any problems with it at all. A couple of days ago I started having issues with it and changed out the batteries, even though the battery indicator wasn't on but it didn't fix the problems. The receiver for it hasn't been moved so that shouldn't be an issue and there are no other wireless devices plugged in and nothing new has been added to my computer. So, what it's doing is this: it lags across the screen, I have a hard time controlling it to do something precise like click/mark a box to select something, if I try to grab and move something it either won't grab it or it'll grab it and not want to let go, if I try to select something that I have to click on sometimes it'll do it, sometimes it won't. If I am highlight something sometimes it won't let go of it, like I can take my finger off the mouse and it's still highlighting more things if I move the mouse if that makes sense. Sometimes it seems to work better if I take it off the mousepad and other times it doesn't. It is a mousepad for a laser mouse so that shouldn't be an issue.
I work from home and I'm on the computer for my job so I use my mouse a lot and this is hindering my ability to do my job, which I REALLY can't have right now because of some early deadlines I have coming up so I'm frustrated to no end. I am ready to just flush this mouse. Seriously though, I am on the verge of just buying a wired mouse just to be able to get my work done.
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Sometimes it's as easy as blowing the dust out of the lens assembly on the bottom of the mouse. Depending on the mouse (esp wireless ones I've found), dust can make a profound difference in how the mouse operates on ALL functions (might have something to do with the mouse's tiny processor being overwhelmed?).
Since this seems to of some urgency, and diagnosing some problems can take awhile, I'd go ahead and buy a cheap $15 wired mouse and give that a try first. Get your work done, (if possible) then tackle the problem.
If you've installed or updated/patched the OS, any programs, or any drivers recently that could also cause problems.
Rolling back to a restore point to the day prior to the update/install could eliminate the problem. Restore points are automatically created when most updates/installs are performed. However, backtracking to a prior restore point can cause other issues, so you should search for and read up on "restore point" and "side-effects" or permutations of related words before you do.
I'd also make a FULL system backup before doing anything. I highly recommend either freeware Macrium Backup Free Edition, or DriveImage XML. I consider them very high-quality, safe, and reliable programs, and numerous tutorials (even videos) exist if there is any question how to do something using either backup tool. I consider either one far superior to Microsoft's backup program, although I personally prefer Macrium Reflect Free Edition.
With a full backup if you make a change and it causes more problems than it fixes, you can always return to your exact current state within minutes without any problem.
you might need to try updating your bluetooth drivers, since that could be the reason you are experiencing the issue with the mouse disconnecting. Usually, we find that the bluetooth drivers are slightly outdated, and this can correct the problem.