One night on our way home the car just leaked all of the transmission fluid out

For about a month now every now and then the yellow exclamation light in my car would start blinking and then stop. At first I thought it was nothing and then my husband said the car started to sound like it was "rattling" or struggling to speed up and sometimes it would jerk a little. One night on our way home the car just leaked all of the transmission fluid out into our garage. We took it to two different shops.1 said it might be a seal the other actually hooked it up to diagnostics and said it didnt read that anything was wrong with it. We took it home and less then a week later its began to do the same stuff. The light hasnt come back on but my husband says the car leaked fluid again and when it drives it feels like its really working hard.