Continuing the discussion from Wdr3600 v1 ath79 5GHz low range, 2.4GHz packet loss after days:
1.Installed stock firmware.
2.Updated to latest stock through stock.
3. Reverted back to openwrt, 18
has fixed issue of low 5ghz wifi signal,
overall performance increased ,
no wifi drops or packet loss so far,
Have not tried 19 yet.