RE: Does your DA50 do this?
Here is the latest from Brian at DA.
There are "hundreds" of DA50s that have this problem, DA thinks it MAY be a problem in the Walbro carb but dosen't know yet. Walbro is investigating. Also the person that designed the DA50 is investigating. Right now if you press them on this they will send a replacement carburator which may or may not fix your problem.
They HAVE re-created this on a test plane at DA but are no closer to resolving it.
Joe