Any issues with any other wifi connected devices?
I would try setting both V6 boxes up on the 2.4GHz waveband. Yes, it's a slower connection than 5GHz, but stronger, plus yuo don't need the faster connection on the V6 boxes.
Or if possible try connecting both via ethernet cable.
It might also be an idea to do a search for an app such as wifi analyzer which tells you the strength of the channel you are connected on, and also shows other channels so you can decide if you want to change the channel number on your hub for a stronger signal.
Advanced Settings > Wireless > Wireless Signal > beneath both the 5Ghz and 2.4GHz sections click on the manual button, and in the drop down box click on the channel number you want to change it to, then scroll down and click on Apply Changes.
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