You may wish to get this moved to the FTTC thread as you are clearly on VDSL.
Your DS speed of 39994 looks rather like a banded profile.
Can't say when that happened but your line stats for 'previous 1 day time' are horrendous - what on earth was going on?
The US UAS (Unavailable Seconds) is almost as many as there are in the day.
The 'lastest 1 day time' is pretty awful too.
With stats this bad I'd be looking at a line fault - have you tried a Quiet Line Test to see if there's audible noise on the line?