@Alexandre. 

Had to take a break from the computer after work finished and sat down first today but haven't dropped connection so far so haven't checked logs.

  @Jsectp 

You can check logs anyway. This is how I found the scope of Internet connectivity problem with my ISP. Just login to Main Deco, set logs to DEBUG, download current logs to local drive and search for these log lines. 

If you find any, that means issues still occur while you are not using WiFi.

I suggest to do that few times in next few days even if nothing happens when you use Internet access. What I have found in my case is that outages had happened at different times day and night, but each was of about the same short duration. Most of these gone unnoticed by me. I didn't realize frequency of outages until I started to check logs.

With that info and a bit of persistence on my side ISP Tech Support was able to find and correct the issue on their side.