I've done a full system scan with Norton, as well as Ccleaner. I had turned off all unnecessary startup programs but I'm running windows 10 so as far as background processes it is hard to tell how much of it is necessary, for me at least. I've had the laptop for about a week and the problem has been around since I first started using it.
I feel like your best option now is to perform a fresh install and 100% wipe out the laptop. That will get us back to a point where we know exactly what is being put onto it.
You can use the 'Reset This PC' function in Windows 10, or you can visit Microsoft site, download the Windows 10 .ISO onto a flash drive and format your laptop that way.
If this is something you've never done, we can walk you through either of these processes. This would be my suggestion to do, before you attempt to RMA the laptop which is a process that can be both smooth or rage inducing.
The good news, is that I've been through MSI RMA process twice, and both were very excellent experiences - I'd highly recommend we try the above ideas first and proceed from there.!