I would tend to say many of the problems are caused by one of the two main problems.
A slow internet connection in general.
My mate was getting about 8Mbps and it was unwatchable. Took his box to mine and it was
a good service at 20Mbps, watching the footy.
So check your internet speed.
The next biggy is all the re sellers out there at the mo. Everyone is jumping ship from sat c/s
and there are plenty of people who won't be around in a few months, so find a good server
and stick with them.
Finally I generally don't buy the ISP throttling your internet speed, especially for footy, it's just
the shear demand on bad servers.
People cheap out on servers, it's a big mistake, you generally get what you pay for.