1999 volvo S80 Transmission shifts

[James1]

When stopping at a stoplight when hot in D the trans acts like it doesn't return to first thus slipping on takeoff.Like its in fouth or still in tc lockin. I can change to W mode it does ok. Does anyone know what the W mode changes. Does it go to a differant section in the TM or what? . W mode doesn't effect the shift patern/times or tc lockuphanks