Hello, CH
I have a problem similar to casse2go's post on 1/18/20. My laptop is giving me multiple "Last USB device you connected malfunctioned and is not recognized" error messages when I haven't connected anything. But unlike casse2go's problem, it has not affected any other computer process or operation. It will start by sounding a USB device removal tone, then about two seconds later a USB insertion tone and malfunction alarm. The frequency of this cycle can vary widely. Sometimes it will repeat the pattern every 10 or 15 seconds for several minutes; other times it might not do it for ten or fifteen minutes or even an hour or more. It often starts when I first go online or shortly thereafter, but not always, and seems to involve Internet Explorer although I use a different browser. Also, it will even sometimes do it when the computer is asleep.
I have an LG Gram laptop running Windows 10 Home Version. I have not recently installed any new programs, and I have done multiple virus scans, including boot-time scans, with Avast but they always come up clean. Task Manager shows a momentary 7 or 8% spike in CPU usage when it occurs, but I cant find one particular program causing it.
Although it doesn't seem to affect any other processes, it does get annoying when it keeps making alarms when I'm trying to do something else like watch a video or eat dinner. Any suggestions would be greatly appreciated.