I have a 05 GLI and I have the normal turbo lag, which is usually only bad under hard acceleration from a stop. But, it's gotten better since I put a K&N drop in air filter when I did my 40k service, to help some more air circulate. I am happy with the filter, for sure.
As for your other problems, I'm not really sure. The only thing that I can think of with the Cruise Control turning off, is maybe a faulty brake light switch? I would check with your dealer to make sure that recall was performed. Because if the car thinks you're stepping on the brake (even if you aren't because the switch is broken) it will override the cruise control if you have it on...But if it completely turning off, there could be another problem that doesn't concern the brake light switch at all; I would get it checked out. If you have a warranty on the car, then I would definately take it to the dealer and have them address your concerns. It's worth a shot.
Hope I helped a little bit...Good luck with the car!
