Repeat after me :
You get what you pay for. Speeds and reliability of residential broadband service (whatever technology) are
NOT guaranteed.
Time after time I see people get awestruck by the marketing bull only to be surprised by the reality.
The reasons why speed is not guaranteed are numerous and too complex to list on PPRuNE. These include but are not limited to :
- Contention (deliberate or natural) anywhere on the ISP network or "internet"
-Rate limiting / traffic shaping
etc. etc. the list goes on.
If you want a slightly more consistent service, cough up business broadband prices.
(apologies for the slight rant by the way !)