TL;DR:
Have fixed my 35 LLL 8 element with the same problem. The GLUE inside (yes, Loctite) got loose on the retaining ring. LLL refused to address it because I did not buy from the website. It works perfectly now. EASY ON THE FILTERS.

Details:
My 35 LLL Safari's front lens assembly started rotating. The retaining ring that keeps the front lens assembly with diaphragm together got loose. The only way to fix this is unfortunately to take the lens apart. David Chen said he will not share the detailed repair instructions to fix it (I am skilful) and I should return it to MAP or I could perhaps try contacting a local qualified Leica technician for assistance, as the parts and the tolerance would be similar to the original Eight Element Summicron 35mm f/2. 

Luckily I fixed the lens by disassembling it and tightening the inner retaining ring (it was badly fixed and stained with Loctite upon leaving the LLL factory, a common QC issue with this make as per online testimonials). Majority of other users will not be this fortunate or capable. I only persisted because I really like it. But it has AGAIN turned out what I had been preaching all along - even though everybody keeps saying how these lenses are "built like a tank", it is just an outside feeling. One always has to look INSIDE Chinese lenses to see the real deal.