DLM is reset if changing from BT's WBMC to GEA (or vice versa) or if the product's speed is changed (e.g. 80/20 to 40/10 and so on). I can't say whether banding sticks when changing product speed though, I don't imagine it would certainly if downgrading to 40/10.
When one month contracts become a reality one day in the near future then it should be easier to reset DLM by simply changing speed (regrading) and then next month regrade again (if desired).
Edited by Ixel (Sat 04-Nov-17 21:26:53)