This issue remains even when the WLAN/network connection is fully re-established! They either have empty pages, or an error like 'There was an error reading from the stream' or 'There was an error reading this document (109)' occurs. a) because of sending computer to standby, b) undocking computer from docking station so connection changes from ETHERNET->WLAN, c) a bad WLAN connection including a change of WLAN network while walking through a building), all the PDFs that were open before cannot be viewed anymore (note that the issue does not appear everytime, so might be hard to reproduce reliably). However, as soon as we loose connection to the server only for a couple of seconds (happens very regularly, i.e. When opening the PDFs from the server, they work as expected and we then keep them open in the background. We have thousands of PDFs stored on a server.

in our (large) company, we use Adobe Acrobat Standard/Pro 2017 for PDFs. I upvoted this because myself, my team members and many many other users of Acrobat have the same issue (just google it), let me copy my bug report from :

Adobe 10 10 error