For some time the problem plaguing me ..
It is quite normal in every workplace that they are both ready (according to the device properties) and it works perfectly well otherwise. When I booted the PC, I put a CD, it will read, etc. But after a while comes at a time the error message. "The device is not connected".
The Philips drive reads the CD is simply no longer a ... But without an error message if you double-click. If I reboot the PC again, do they work properly again. Mean, from time to time. Because there is sometimes referred to above problem even after rebooting.
I have just renewed the complete hardware, everything worked. The Philips drive is also new, more than half a year. This should be mentioned that my fans, if the PC is turned off 3-4 hours.