997 c2s issues

[911steve]

hi all new to this site and in need of some help and advice? i have a 56 plate c2s tiptronic with 55k on the clock, a couple of months ago noticed a squeak when in drive with my foot on the brake............a week later had no drive and a micro switch was changed and the car was mobile again. a couple of weeks later lost drive.....recovered home if the car is cold it drives but when hot all drive is lost? have spoken to several people about this problem some are saying torque converter some are saying gearbox? can anyone help or has known of this problem? many thanks steve.