My Planar 50mm ZM had the wobble, and the focus bind with the hood not quite on all the way, and there was some various debris and a spot of fungus starting inside. Mind you, I use my Leicas very hard, I'm a hard charging PJ style all film old school wedding photographer, so stuff gets whacked about. I got the lens very soon after it came out, from a west coast dealer that gave me the warranty thru Hasselblad (yeah, it was that long ago) and so I had to send it to Hasselblad in NJ and thats where it sat for quite a while, I think it was around the time when Zeiss and Hasselblad split their ZM agreement. So, like a month or two goes by, and I hear nothing, I get a letter in the mail saying the lens was 'recieved' a full month After I sent it (saved the shipping, you never know) and that they'd let me know. Another span of time past, I gave a call and the very helpful gent at Hasselblad said it probably went off to Germany (!) to be done., but he doesn't know where it is. Days, weeks pass, and on this fine Rangefinder Forum I spy the post of the New Zeiss liason, and I send him an email to which I got a near instantanous reply, and within a week he had the lens location all sorted out and let me know the moment it was back on its way, which was very soon, less than two weeks. Once Zeiss's Richard Schleuning got on the case, it was all better. There is nothing better than having the company who makes the gear provide the warranty and repair of it. And BTW, the lens came back perfect, it still has my brassing marks (told you I'm hard) but the wobble is gone, elements are clean and I'm sure that it focusses even smoother. Zeiss gets my warranty dollars for sure.
