Don't find a new hobby, you were doing so well and we enjoyed looking at your great photos, Please don't start making us look at your needlework or paper mache dolls.
At least now you have solved the problem. It is not the camera, it is an incompatibility of the Lee system with the A7RII camera (Possibly something to do with the removal of the anti-something filter in front of the sensor). The fact is that you only really need speciality filters like Neutral density, grads, polarized or infra-red (if you get into that). You do not need any other type of glass between your subject and your superior sensor. Use the Lee system on any other camera you have and spend a little more (comparatively) on quality round screw in filters (Hoya or B+W). To me that is the only workaround I would consider If I was fortunate enough to own the Sony A7RII. You can't go and buy a Canon or Nikon + lenses and get the same fantastic photos that the Professionals (and you) are now getting with the Sony full frame cameras. I admit that in the end it is the photographer that takes the picture, not the camera, however the camera sure helps a lot.
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.