Inconsistent Relationships with linear motion components

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Hi Everyone,
We are roughly a year into Inventor and there is one problem has been more problematic than any other. Inconsistent relationships. We use alot of slides that are constructed of linear guides (THK, Hiwin, Etc.) or complete guided linear actuators purchased from vendors (Parker, Festo, etc.). We seem to almost ALWAYS run into inconsistent relationship issues with the linear guides. This is our current process: Download the linear guide assembly from THK (STEP), save as Inventor file, constrain the blocks that move to the rail, then insert this assembly into our main assembly. We then will usually constrain the rail to it's mounting detail, then make it flexible and create applicable posiitions (showing slide forward and returned, etc).
At some point from then on as our assembly progresses, we eventually start getting "inconsistent relationship" errors and they point to the constraints that we made WITHIN the linear guide assembly, i.e. the blocks to the rail.
Is there some known issue with a flexible component that when you have it in an assembly and then set up positions it just doesn't like it?
Could there be issues with importing STEP or IGES files, and using them as flexible to show motion?
Thanks for any suggestions.
Ron