I also hope for you it's a one-off, but I've been having similar issues with my kit (only one side) for the last year or so. Sounds like I'll look into that Hylux kit.
I've had a lot of problems with morimoto also, but in a different car (not the VW). Not sure what it is. Same problem as described above. One side won't come on unless I flick the lights on and off. Sometimes it will flicker and come on slowly. Sometimes it will work fine. I've replace the igniter, ballast and relay on that side multiple times. Issue will be fixed, but then come back. Said fuck it, bought a whole new morimoto kit bc I thought it was the wiring since new components kept going bad. The new kit was good for awhile, but same issue is happening now. FML.
Morimoto HID kit- Ugh, so damn annoying, my right side low beam bulb won't ignite. I'm guessing it has something to do with the temperature? It's getting colder lately, 4C/39F. I've tried power cycling maybe a dozen times and it still won't work, it seems that I have to wait for it to warm up a little bit and power cycle a few more times for it to hopefully ignite. Although maybe that's just by luck if temperature doesn't have anything to do with it.
I might have to look into the Hylux kit. Did anyone end up going LEDs on them?