This line is heap of [censored] and barley gives me 6mbit these days and BT/ISP have lost all interest in it BT have withdrawn there FTTC we where due to get 2 yrs ago and that's that.
The errors stopped a while back but I don't remember why/when. I have a specific DML profile set for my line but other than that - no sorry.
Not sure why you should get them on an FTTC connection. I suspect mine was due to line loss and noise causing time outs, but I also remember BT finishing an upgrade project at many exchanges.