OK - good. I like to go from easiest to hardest (all being relative of course).
You still have some options:
1) Open the Event Viewer and check the logs for any errors or warnings that occur(ed) at the time of or just before the disconnect. Viewing the logs can be overwhelming but if you keep checking them you will soon get a sense of it all and be able to notice something unusual or unexpected: e.g., some application starts up and you know you did not start it. Also, often overlooked, is that you can right-click an entry to get more information about that entry.
2) The other option is too just reinstall the drivers and the ASUS adapter as if new. Could work but if there is some other factor involved (something that could be noted in the logs) then the reinstall effort will be for nought.
Poke about in the logs as best you can. Errors and Warnings are well flagged. Do not react immediately to any given entry - there are many such errors that occur without any necessarily negative effect. You are looking for a pattern, a consistency of occurence with the time of the disconnect.
Try to get an error code if at all possible if you find some corresponding log entry.