Hello and thank you for contact with FTS.
We are sorry to hear about the problems with the Esprimo Q558 but without a deeper analysis we are unable to provide you with any specific solution.
From the problem description we can only assume that such unwanted behavior could be linked with receiving the automated Windows updates but since we do not work on assumptions, please contact our Fujitsu Service Desk using this link:
https://www.fujitsu.com/global/support/ and select the desired region/country.
Kindly provide required information and possibly the required logfiles.
Kind regards,
Forum Support Team