4T60E trans

I have 1993 olds 88 with 4T60eE transaxle, When it gets warmed up it loses all gears, (acts like in neutral). Could this be electrical?

nope!!!! try replacing the filter,,,could be plugged!!

Already did that , ran ok for three days then same thing. Ran scanner on car. It said vehicle speed sensor was shorted, so I replaced it. Still the same. If you turn car off for about 30 secs. then restart it will go in gear for about 1 minute.May be ECM?