Many thanks for the helpful input. There is a recent update to the Ver 5 firmware dated 2019-04-15 Archer C9(US)_V5_190403 to improve the stability and performance of the device. I'm going with US...

Many thanks, Kevin, for your very helpful and prompt reply. In looking more closely at the two routers I see that one is an Archer C9(US) Ver: 5.0 while the other is an Archer C9(CA) Ver; 4.0. Is...

This is the second Archer C9 router I've installed in recent days. The first router prompted me through an automatic upgrade to ver 5 (firmware 1.2.4 Build 20190403 rel.63869(5553) hardware ArcherC9...