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Hi,My name is ***** ***** I will help with your question. The first thing I would suggest is to check the TV firmware is up to date. Have you tried a static IP address for the tv.
Sorry the phone call request is automated by just answer.
What happens when the TV is connected using an Ethernet cable. How does it affect the other devices?
Could you send me the model number of the router. Do you know if the router has QoS built in?
Does it make any difference if QoS is disabled?Does it make any difference if the TV is listed as DMZ in the router and not behind the firewall?
I am thinking it may be worth trying the TV on its on VLAN the router looks like it will support a VLAN but that would take a bit of planning to make sure we get it right. I had a bad experience once with a VLAN in a school and I spent an afternoon putting things right.
Thats fine by me.I would make a backup of the router config first.I would start by putting in the DMZ this means the TV has direct access to the internet and is not behind a firewall.
I honestly expect this to make no difference but it would be worth a try.I would then try disabling QoS in case the TV is fighting for all the bandwidth.
Other things to try but these are getting more technical is to put the TV on a VLAN. A virtual LAN is a lan but only certain ports are on it, so the TV would be on its own network with access to the internet but no access to the other devices on the network. The TV would be isolated from everything else.Another thing to do is to use wireshark to have a look at what data is being transmitted from the TV you will be able to see every thing the TV does on the network ie does it ping the router alot or is it broadcasting its address alot. It would help to confirm what is wrong with the TV it could be the router does not respond quickly and the TV keeps asking the same question so to speak.Here is a link to the router manualhttps://www.manualslib.com/download/615388/Zyxel-Communications-Vmg8324-B10a-Series.htmlInfo on Vlan
https://en.wikipedia.org/wiki/Virtual_LANI do have somewhere a very good article on Vlans I will try and find it and upload for you.Wireshark Linkhttps://www.wireshark.org/
I do agree it is not ideal to expose the TV to the internet without a firewall I feel that if the TV works OK on the wifi it should work OK on the lan so removing the firewall from the TV shouldn't make a difference.Downside to disabling QoS is the router will not prioritise traffic. If you have qos enabled devices that need more bandwidth are allocated more. If you were streaming you would have more bandwidth available that someone looking at facebook.Your chrome cast may be affected it depends on how the router uses the vlan it could be that the TV is isolated from the other lan ports but not from the wifi lan and the internet.The sky q should be ok because the main sky Q box would on the same network as the sky q mini box it would only be the TV that is isolated.Wireshark is great but in the space of a few seconds you will see hundreds of data packets so you need to use filters so you will only see the TV requests.The chromecast is wifi
If you need any more help feel free to contact me.Good Night I am in the UK in the midlands.