The only thing that is constant is the fact that the sync rate gets lower.
ADSL2+ is a waste of time on the ancient copper network (from house to exchange) here.
Karoo run fibre almost everywhere else so why can't they replace the aging copper that is left and give us users the at least the speeds they claimed from ADSL2+? Only they know the answer to that one but I can speculate.
They KNOW ADSL2+ is poor and they KNOW how to fix it so that everyone will get a nice speed bump but they WON'T do it. They STOCK refuse to do it. why? Because if they did a part of the company would disappear.
Karoo's stock is dropping faster than rain from a black cloud. The company is dying and they know it. They are ripe for the picking but we users do not want that to happen because if it did the cost of both telephone calls and braodband access would go up.
They know that to replace the ancient copper here is the way to go so why don't they just get on and do it?