Thank you for your expeditious response,
Sorry for the omission. I am using Window 10 and Opera version 48.0.2685.39 (PGO). My connection is fibre 100 Mbps. I turn WIFI off then log on via cable. In my case this problem happens constantly, every 10 minutes or so, the message lasts for 5 to 10 seconds and then it reverts to normal again. I re-iterate that this only happens with Opera and not with other browsers. I could easily make Opera redundant and use one of the other browsers, but I prefer Opera so would like to resolve this hassle.
Interestingly, when logged on via WIFI there is no problem.

"your connection was interrupted. A network change was detected"

This message and the connection being dropped keeps occurring whilst browsing, using Opera, but if I switch to Edge there is no problem. I have updated my adapter's driver, cleared the cache in Opera and in the computer, but all to no avail. Can you please suggest a solution.

I right click then copy from drop down menu. It appears to work OK with notepad, does this mean that the problem lies with Open Office?

I am running Windows 8, using Open Office and am experiencing a problem in that when I attempt to copy an item from Opera and paste it into Open Office Writer, in about 90% of the time I cannot paste the item. The paste command is missing in the drop down menu if I right click, and it is grayed out if I go into edit. If I attempt to copy the same item from I.E or Firefox it works perfectly.
Since I prefer using Opera as my default browser, rather than using one of the others, I would prefer to remedy the problem with Opera.
Is there a solution?