T400 "USB device not recognizable" pop up

Hello,
on my T400 a pop up appears every 5 seconds with the following message "USB device not recognizable ... etc".
But I don't have any device connected to my Laptop.
What could the problem be?
Tks

Hello grecoluca, welcome to Lenovo forum!
please check all usb connectors in your T400 sometimes the inner small metal latches are twisted and cause some annoying issues.
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