Archer C6 dropping internet connection intermittently
I am using the Archer C6 connected to my modem as the main router, and have the deco X20 3-pack connected to it as my wifi system. I have both 2.4 and 5GHz wifi off on the Archer C6, and wired internet keeps dropping connection. I have called my ISP and they say that the issue is my router, even though i have asked them to check for any IP conflicts on their end (there was one last night, but even after they refreshed it on their end, i still dropped connections intermittently through the night and this morning.).
System logs do not show anything, I can get internet back by releasing and renewing the IP connection via the admin page or by rebooting the router. I have attached the syslog below. Also i noticed that the system log does not show anything about the internet disconnection? I only notice when my internet goes down over ethernet and my deco X20 shows red light which means no internet.
I have tried turning off upnp. I would appreciate any help i can get, i have seen past posts on older beta firmware being more comfortable, and i dont want to upgrade to 1.3.6 given all the same issues also exist according to other posts. If there is really no way to fix this, i am not against using openwrt.