Poor 5 GHz performance on LG V30
I bought the AX1500 and so far, it's been pretty good. However, two of my devices, a pair of LG V30 phones, get poor speed and sometimes no Internet at all. They connect fine and show a good link speed, but the Speedtest app only shows 0.1-10 Mbps and sometimes fails. All other devices (an LG V10, MacBook Pro, and iPhone 7) show 100-200 Mbps on 5 GHz (my Internet speed is 200). They all support 802.11ac.
I thought maybe my V30 was the problem, so I tried Internet sharing on my MacBook Pro and it showed 70 Mbps (not surprising, the Ethernet adapter is only 100 Mbps). The phone should at least be that. Already tried using it close and even next to the router and in the same spots others other devices work fine. My previous router didn't have this issue. It was another make and it was an 802.11n/WiFi 4 router.
Did I do something wrong with configuration on my router? Is there a setting I should check?
Thanks!