Low fluid ?

Hello how are y'all doing, I have a question about the transmission. I have a 904 I drove it around for a good 3 for hours an right before I pulled into my drive way I have to drive down a short tight S shape road after making the second bend the car started shaking an the acceleration wasn't really there.I pulled the dip stick had fluid on it but it had a burnt smell hmm like rubber or plastic, which I smelled once before. would this be a cause of low fluid ? It leaks a little bit an idk how accurate my dipstick is because it missing the top handle, any advice would be appreciated,I will also be changing fluid an filter here soon