I have checked your service and the service has not dropped in the last 14 hours.
-How often is your service dropping on your end?
-What Speeds are you getting? Please run below speed test and let me know what results you get.
I can also see there is a bit of traffic in your uploads. Can you stop the uploads and retest your service?
Your on an NBN FTTP service this the better NBN service to be on.
Your speed is fine for your NBN12 plan. If the issue goes away when you close the laptop, I would say you need to work out what is running in the background on your laptop, that maybe uploading and slowing your connection down.
The other thing you could look at would be upgrading your plan to a faster speed.