Wifi 5GHz cannot connect Linksys WRT1900AC after upgrade to 18.06.4

I was using LEDE 17.01.4 upgraded to 17.01.6 via: lede-17.01.6-mvebu-linksys-wrt1900acv2-squashfs-sysupgrade and on my Linksys WRT1900AC and it was rock solid. I only use the 5GHz radio on the Linksys and I use a Unify long range access point for 2.4 GHz. The access point wifi is working fine.

I recently upgraded to OpenWrt 18.06.4, r7808-ef686b7292 via: openwrt-18.06.4-mvebu-cortexa9-linksys-wrt1900acv2-squashfs-sysupgrade and now my 5GHz wifi is effectively unusable.

Various phones and laptops see the 5Ghz SSID but fail to connect and eventually give up.

I used these command to increase logging:

root@LEDE:~# uci set wireless.radio0.log_level=1
root@LEDE:~# uci commit wireless
root@LEDE:~# wifi up

The wifi up seems to fix the issue for a couple hours but then it stops working again.

I watched logs on the router via ssh with logread and nothing shows up in the logs at all while the devices are trying and failing to connect.

The luci web interface also seems very slow to load and/or times out completely, but ssh interface is snappy.

$ wifistatus

	"radio0": {
		"up": true,
		"pending": false,
		"autostart": true,
		"disabled": false,
		"retry_setup_failed": false,
		"config": {
			"hwmode": "11a",
			"htmode": "VHT80",
			"channel": "auto",
			"country": "US",
			"path": "soc\/soc:pcie\/pci0000:00\/0000:00:01.0\/0000:01:00.0",
			"legacy_rates": true,
			"log_level": 1
		"interfaces": [
				"section": "default_radio0",
				"ifname": "wlan0",
				"config": {
					"mode": "ap",
					"macaddr": "<redacted>",
					"encryption": "psk2",
					"key": "<redacted>",
					"ssid": "<redacted>",
					"network": [
					"mode": "ap"

Maybe I need to completely wipe the device instead of sysupgrade?

sysupgrade -n /tmp/openwrt-…-sysupgrade.bin or invoking firstboot would do that.

Given that 19.07.0-rc1 has been published recently, I'd try that first (as it will provide the current/ final driver state):

I used the sysupgrade with -n and it's working much better. The luci web interface is fast again and 5GHz hasn't gone down after 24 hours.

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