Hello M.CHEN
Sorry for not replying for such a long time. There is no exclamation mark in the device manager. I have observed that this issue occurs when i install a software or when i extract large rar archives or even when i use any program of the office pack.
My pc runs on windows 8.1 / 16 GB of Ram / Intel i7 4700 MQ / 1 TB HDD / Nvidia GeForce GT 740M so i really have no clue why this happens. The operating system is up to date, i have Bitdefender Antivirus, Malwarebytes, i use CCleaner, HDD is fragmented weekly.
I have also observed a noticeable slow down of my pc in the last 3-4 weeks despite of how fast it is supposed to be. I've had a pc running on 8 GB of Ram and i5 3210m and i can't tell if there is any difference between my two pc.
Do you have any suggestions please?
Kind regards
Madris