looking at how your speed syncs at a higher than 1.2mb rate you are probably uncapped.

Your stats are poor, attenuation and noise margin. You are getting alot of errors in a short period of time which also usually indicates a very poor quality line as well as possibly poor internal wiring.

Are you sure you where actually syncing at 2mb with your previous provider as you said you had no need to check stats.

Your line should firstly be capped at 1024/400 and checked to see if it remains stable and then if it still poor and fluctuating further changes may be needed.