Xbox one crashing home internet-Help please

Hey everyone,i recently purchased a brand new Xbox one 500gb and all was ok with it for about 3days or so. After this i noticed my home internet was playing up both on WiFi and anything plugged in by Ethernet. The XB1 is connected by Ethernet cable
and my home download speeds which i do on speed test.net are normally around 6.7mbps down and around 0.35mbps up with a ping of 27ms,these tests are normally always done on my PC which is through Ethernet,also when i do them on any WiFi device they are normally
pretty similar.

When doing a detailed network test on the XB1 the latency is really really high and its crashing my home internet and it is unusable,by realy high i mean the latency is 6000ms and download speed is 0.04mbps and upload is 0.01mbps. I tried the DMZ host
option on the modem,tried opening ports,tried with both UPNP on and OFF..no difference at all. Tried a hard reset on xb1 and also modem,still the same result,also tried static ip both on the modem and xb1,no difference.Also tried to connect the xb1 through
wifi to see if that helped,same result with no difference.

If the xbox is connected to the internet it makes the whole home network unusable and unstable,nothing loads,everything times out,both on wifi and ethernet. As soon as the ethernet cable is disconnected from the xb1 the internet goes back to normal
speeds and ping and is usable again,

I tried everything,thinking the modem was playing up,so i bought a new modem (Billion 7800NXL) and all new CAT6 Ethernet cables,new telephone line cord,new phone line splitter (came with the modem) and set it all up and it worked fine for a day then
it went crap again,same thing,if ethernet is plugged in the internet is unusable,unplug the ethernet cable and home internet is fine.

I also have a 4 port ethernet switch that i need to use due to the setup of my house,i have tried not using it and just plugging the ethernet cables straight into the modem and on different ports,i have tried disconnecting the home phone and splitter,that
didnt work either,have tried another phone line socket in the house which is on the same phone number and that didnt work either..

Does anyone have any suggestions that i can try please??? help me somebody

,i have contacted my ISP ( Telstra ) and they have advised me that everything is fine with the connection as there no dropouts or outages or phone line connections etc etc... I live in Australia ( Adelaide,South Australia).

I have been playing xbox 360 games online for years and have never encountered these stupid issues that i am having at the moment,the xb1 console is brand new and it seems that its causing me all these headaches,just wondering
if theres a setting either on the modem or the xbox that i have missed.

Please help,this is very frustrating and is doing my head in

:)

 

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