Need some advice w/ tranny issue
 

Ok whats up everyone i'm new to this so i hope i explained everything the way i should of here's my problem . I have a 1998 audi a4 avant quattro automatic with the tip tronic transnow on some occasions when i get onto an on ramp the cars tranny will shift fine from 1st to 2nd when it goes from 2nd to 3rd its feels like the tranyy slips the rpms race and then it catches but it catches quickly . it will also do it sometimeson an incline or when im going up a hill. I really wanted a manual for these reasons but my wife begged me for an automatic and he i am . hope this helps guys any info would be appreciated. Also i just recently purchased it from a used dealer and they say that nothings wrong with it. :(