I bought a used 2005 Volkswagen New Beetle convertible about 4 months ago. It had about 200000 miles on it. The transmission acted fine. Since then, I have put about 7000 miles on it, and the tranny now delays shifting, has gotten stuck in different gears, 3rd and 5th, and takes about a minute to shift into gear when you put it into drive. It slips gears randomly, will rev up without increasing speed. I've gotten a code for clutch slippage, torque converter lock up, and tiptronic switch problems. Any help?