Really? The only system, from most made, you can name it and I likely have it, Hasselblad is the only one that gave me a wobbling lens in the mount. Never happened with Bronica, Pentax MF or Mamiya.
Interesting:
Was the wobbling along with the optical axis (forth and back) or perpendicular to the optical axis (left to right)?
Did the lens mounted securely?
Did the system worked as it should, like releasing the shutter to take a picture and then cocking it again?
Where the pictures then taken unsharp?
Did it happen with other lenses too?
Was the camera's lens mount undamaged and did the bayonet catch worked smoothly?
Was the lens's bayonet worn or damaged?
BTW, about the Hasselblad's bayonet catch: this tiny system is lubricated too, and after a long period this lubrication can become gummy, if not simply soiled, and by this not working smoothly nor locking securely (not to mention the spring...).
This happend to me too. I did a simple DIY repair with Ballistol (yes there we go again!).
This gun oil, like many others, is not only a good lubricant, but an effective cleaner too as it can dissolve the residue of burned gun powder.
So, I stuck some paper towel in the bayonet around the little catch, put the camera bayonet upwards, ad dripped a (very-) little amount of Ballistol on the unlocking knob (I used a syringe). This fine oil flowed around that knob into the catch system, dissolved the old lubricant, and the dirt, which came out in the bayonet, and was sucked up by the paper towel.
I repeated it till what came out was clear. Then with some canned air I carefully blew out the excess of the gun oil and that catch worked as new...
This took some time, but time was a negligible factor in this case...
