ok, i swapped my new modem for my old one, voila, problem solved!
_but_ i have to use my new modem, because it has build in voip (hardcoded secret password, so i can't use lmce
really,... don't ask)
so i have to figure out what exactly it is thats different between the 2 modems thats causing this problem.
if anybody has any ideas, please share, as i am grasping in the dark on this one.
if i find anything new i will post.