Running 19.07.0-rc2 r10775-db8345d8e4 on my R7800.
On this firmware - and all of the previous OpenWRT versions I installed since I purchased the R7800 during summer - I get an occasional loss of internet connectivity on some wifi clients. Perhaps 3-4 times a day. Wifi connection symbol in windows stays on, but loss of internet connectivity is detected by Windows. I also confirmed I cannot ping any other devices on the LAN. The loss of connectivity lasts about a minute or two - and then it is working again. If I disconnect/reconnect Wifi it is resolved (until it hits again)...
Wired Ethernet seems OK, so I do not believe this is a WAN issue - but rather some Wifi/routing issue.
Few weeks back I tried switching the wifi firmware to the "-ct" version:
[ 11.994391] ath10k_pci 0000:01:00.0: qca9984/qca9994 hw1.0 target 0x01000000 chip_id 0x00000000 sub 168c:cafe [ 11.994431] ath10k_pci 0000:01:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0 [ 12.005519] ath10k_pci 0000:01:00.0: firmware ver 10.4b-ct-9984-fW-012-6acc9b999 api 5 features mfp,peer-flow-ctrl,txstatus-noack,wmi-10.x-CT,ratemask-CT,regdump-CT,txrate-CT,flush-all-CT,pingpong-CT,ch-regs-CT,nop-CT,set-special-CT,tx-rc-CT,cust-stats-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT,wmi-bcn-rc-CT crc32 2f261949
...but this had no effect on this problem (on the other hand I now witnessed a crash of this firmware in the kernel log; but only one).
Does anyone have a clue here? Seems there are a lot of happy R7800 users here, so I am puzzled why this hardware is acting up for me...