I have been a Nos customer for less than 5 months.
I have had internet speed issues for the last month, usually during the day when I am working.
I called the support # 931 699 000 - told me I need to change the router.
I found out in the shop that most routers are refurbs
New router has made no difference and in fact the service is now worse.
I pay for 200/mbs download and am luck to get 2.
The chances of the problem being the router both times, whilst nonzero, is unlikely.