HES Solaframe Studio and Theatre flicker


I was wondering if anyone has any experience with HES Solaframe fixtures and trouble with flicker and position sync issue when switching between W-DMX gen 4 and 5?

In our venue we have had no issues with fixtures that are using a gen4 Swisson W-DMX transmitter, but started getting occasional dimmer flicker and position kicks when we bought a new Swisson gen5 W-DMX transmitter. The recievers in both LX is gen5, so there must be something the fixtures are fussing about with gen5 W-DMX? 

We have tried troubleshooting everything else, and have come to the conclusion that the gen4 / gen5 is the only difference that causes this problem. Any help or experience is well received.