Zen internet issues - QOS my solution?

[Garyj881]

I have been with Zen for around 1 year and for the last 3 month had issues with buffering whilst streaming movies and disconnections.

I am on the Zen FTTC using a ZyXEL VGM1312 router.

My download speed is only 20Mbps and up is 7Mbps. (aluminum cables grrrr)

I have spoken to technical and they are advising me I am maxing my available bandwidth causing our buffering and disconnections.

Example
Room 1 Myself steaming Netflix and gaming on my mobile.
Room 2 My Partner watching Netflix and searching the web.
Room 3 My son On PS4, also on his PC watching youtube and possibly on phone.

The tech guy at Zen recommended setting up QOS as a possible solution, I have never had to do this before. Can someone explain why I have never had this issue before and advise on how this QOS is setup?

I had a quick look and didn't fully understand it.

 

[Garyj881]

OK getting a bit further with this.

Had more disconnections, I started downloading a game through steam after work with no one else using the Internet and 10 mins in I lost Internet. This is with both lan and wan connections. When this happens the router does not indicate an issue.

I have spoken to Zen again the Tech guy asked me to ping BBC next time it happens. So I reset the router and resume my Skyrim download, 10 mins later disconnection again.

So I pinged the BBC, no success, I then pinged the BBC ip address and it reached. Is this now a DNS issue?