I noticed this recently (picture). Tried removing it and reinstalling but after a short time it goes back to the yellow exclamation mark. When i click it the status shows "Windows has stopped this device because it has reported problems. (Code 43)"
Hi, you need to REflash the BIOS. Download the latest one, put it on a USB stick and flash it via EZFlash or whatever the utility in BIOS is called. It solves the issue, had the same one couple of days ago on my A17.