Recently purchased the XE75 Pro and it has really improved WI-FI connectivity 100%.  Now I started using the Guest Network because I also run an Airbnb and want my guests to connect to that network.  At first it runs fine but I started to notice that it still needs a little work.  These are the things I've noticed:  

Network Name:  I assigned a different name to the guest network (i.e Ocean) but started noticing that the system started to forget that name and arbitrarily assign the main network name followed by and underscore and the word guess (i.e. Main_Guest).  What's interesting is that whatever connection existed under Ocean is transferred to Main_Guest without interruptions to the users. So the renaming or guest network is definitively not working well.

Ghosts Connections:  Yesterday I had some guests in the Airbnb from Germany using the recently renamed guest network.  Everything ran fine for the first 2 days.  There were 2 connections labeled "Texas Instruments"; however, the third day I noticed one of the Texas Instruments was now connected to the Main Network and there were 2 connections in the guest network but this time showing the actual name of the devices instead of Texas Instruments.  In this case the guest network was not changed arbitrarily.  So, the German guests left.  I cleared their inactive connections in the guest network.  Turned off the guest network but that Texas Instruments connection was still present in the main network.  What's is interesting is that that connection was disconnecting and reconnecting every 5 minutes.  The only way to stop this was to reboot the whole system.