Leica M2 Slow Speeds Stick

[Kumachrome]

Hi, so a couple weeks ago I got my M2 CLA'd and have just discovered that my slow speeds get stuck. I suppose it's not a huge deal since they're not really used, but still. Shutter speeds 1 second to 1/30 get stuck. By this, I mean that releasing the shutter at these speeds causes the curtain to remain open, like the camera was set to "Timed exposure" mode. While the shutter is stuck, I can't wind it. But, changing the speed to either Bulb or 1/50 will unstick the curtain.
Now, I'm reluctant to spend 120 or so to send my camera back. So, is there any simple fix for this? Or will I have to send it again to another repairman?

EDIT: So, after working the shutter a bit, now the slow speeds are firing. But, 1 second sounds like a quarter second, and 1/2 to 1/30 all sounds like 1/60 or 1/125 or so. Fast shutter speeds seem fine.

 

[Shac]

For now keep exercising all the speeds not just the slow speeds. If this doesn't help then send to Youxin.

 

[Kumachrome]

Thanks. I'll do that. Might have to say goodbye to my precious M2 for a couple weeks again

 

[Kumachrome]

Alright, so after madly working all the shutter speeds 3x each, it seems to have fixed itself! I'm guessing a gear or something in the slow speed escapement got a bit sticky. Thanks!

 

[mooge]

it'll work for now, but"exercising" the shutter doesn't address any of the issues - you'll get the same problem soon enough. Especially if the camera gets cold.

Give whoever "CLA'd" your camera a hard time - that's really sloppy to ship a camera back to a customer with the slow speeds not functioning...