Mains borne interference could be a likely cause.
Can you cable your desktop direct to the hub and a laptop though the adapters? Then see if your desktop drops out or not and if te laptop does. That will narrow it down to either the PC or adapters.
Does the problem tie in with when your heating/hot water is timed to be on? On a fridge or freezer? They will all come on at random times, run for 5, 10, 15 minutes and then switch off. A faulty pump/compressor or one with worn brushes can easily push out noise that will affect the signal.
Can you do without hot water? Your fridge and freezer should last for several hours without power. If so, turn them off and see if te problem occurs. If it has not occurred after say 4 hours, turn them all on again and see if the adapter link fails.
M H C
taurus excreta cerebrum vincit