ok, yet again, I will chime in here, but it's getting really old. I offered two solutions for the OP (via PM and in another thread), plus the return option, which I get is not what the op is posting about. The OP has not tried anything I have offered, but repeatedly posts negatively about it.
1. Try adjusting the potentiometer inside the control box. It reduces the sensitivity to light and could keep the mod activated longer so it doesn't have the halting movement the OP shows. The OP did not try this and it may have corrected his issue. Unfortunately, I no longer have the game so I cannot test this.
2. I offered a time-delayed relay board option, which holds the power on for 1-40 seconds. Again, the OP did not take me up on this and I offered to cover shipping and make the swap free of charge.
3. A third option is to use a different insert or even a GI light, which will hold the motor and light on as long as those lights are lit. That's not how it was designed to work, but is an option.
At this point, and I have mentioned this before, we have not received any negative feedback on the performance of this mod outside of this one case and I will not change boards for the entire mod because one or two people have an issue. I also cannot account for code changes. Instead, I would prefer to deal with this on a case-by-case basis, which I have tried to do with the OP. If there are more people unhappy with this because of the code change, we would consider making the time delay relay board standard, but that has not been the case. OP appears not to believe me.
I'll leave it at that and allow my reputation to handle issues speak for itself.