Ugh, pretty sure I have this same problem. Started up my car this AM and the MFD said that both my reverse lights were out. Sure enough my rear wiper and trunk release both no longer function either.
An interesting thing that led up to this, twice over the past week when I've been at a stoplight a low frequency "bad ground" noise would blare from my sub, I just assumed one of my sub's cables came loose. More likely it was attributable to me having the brake lights on for a long duration and a grounding issue in the wiring harness.
I'm planning to open up the rubber boots this weekend to see what's going on. Really don't want to deal with he BS of changing out the whole harness. Tho this does seem like it's a potential fire hazard and something that VW should look into if it's really widespread...
For the record I have an October build 2008 GTI with 98k miles.