I can not offer much advice on the 3612, I proudly own the 2424. However, in any such case of your post, it is a trunnion/alignment error, and is fixable with any saw. Unless it has experienced damage.
Right after purchasing my 2424 I ran upon a drill bit end broken off and inbedded in a piece of wood I was ripping. It set off a chain reaction which required a total set up procedure. It damaged the insert and fence as well.
The alignments can be relativily compared to a 3 point perspective. Turning any of the 3 angles on it's axis should not cause the other 2 to change. If it does, one of the other 2 is not correctly aligned.
Many things can change the pitch of movement. A worn bearing, bent mounting bolt, a worn arbor, cupped washer, pulleys not in alignment, warped blade; all which must be considered.
To say that a new 3612 will have problems such as these is a total adjustment issue. To say it may need some tweeking; that is common with any saw. Ridgid is highly refined. Not polished... but affordable, reliable and trustworthy.
John E. Adams<br /><a href=\"http://www.woodys-workshop.com\" target=\"_blank\">www.woodys-workshop.com</a>