It looks like a compatibility problem, it is not normal that it is necessary to make several connections and 2 min to initialize the internet, this first point indicates that there will be problems.
Note, powerology does not seem to be a manufacturer, and not at all specialized in network hardware, it is a multi-product OEM, from blinders to vacuum cleaners, which buys from manufacturers and affixes its brand, even if the problem does not exist. is not imputed, it is not a quality guarantee and impossible to have advanced technical specifications, especially on the chipset, Asix, corechips, realtek, others?, this is the most important info that would immediately to know if it is a compatibility problem, Rog 6 or other. Asus is not better, impossible to know the chipset of the Professional Dock
Regarding operation with Apple and Samsung, it's normal, all manufacturers ensure this minimum compatibility, the problems start with other brands or consoles.
Some tips for testing
To eliminate a power problem, only connect the Rog 6
Disables bluetooh and Wifi of the Rog6, Airplane Mode is ideal for testing
Check that there are no energy savings on the ROG6 but also on the router.
If possible, test with a USB-C Ethernet converter from another brand that certifies Android, which has worldwide distribution and support
Of course, I do not exclude that the Rog 6 is in question, there is still a number of fairly large bugs, audio, the impossibility for a device to wake up the bluetooth ......