Thanks for the tip Ultrazino!
Those IEMs to indeed look interesting, I wish I would have known about them prior to my order of the UE900s. The new UE900s I received seem to be working fine so far. I took them for a 8km run and no issue what this time so maybe the bug has been fixed although it might be too early to say. It took me a couple of weeks to break the first pair. Anyways if they break again I'll let you all know, and get myself some German tank IEMs :)..