How do I troubleshoot a transmission issue in my Audi A2?

I recently noticed that my Audi A2 is having trouble shifting gears and sometimes the car lurches forward while driving. What could be causing this issue and how can I fix it?

It's possible that there could be a problem with the transmission fluid or filter. It's important to check these regularly and replace them if necessary. Another possibility is that the transmission solenoids may be malfunctioning, in which case they would need to be replaced by a professional mechanic.