After updating to 32797 (I did NOT, as has been recommended, reset the router and reset/re-add the nodes) I had two experiences within a week of the router RT-AC86U just turning off: no internet access of any kind from either the router or the two nodes; checking the router only the power light was on. A reboot of the router would bring it back. Yesterday I upgraded t0 32799, using the recommended method. Reset the router, reset both nodes, set up the router, added each node back. I hope this will prove more stable. The earlier firmware, 21140, was stable.