Hi. I have a Trimline Elliptical Trainer 6.8 that recently has been starting to give me trouble. I will get on the machine and within about a minute of use, it shuts down. The screen shuts down as well as the pedals get much resistance until I cannot "pedal" anymore and must stop. I have put fresh batteries into the back of the screen but it is my understanding that is not necessary, as maintaining a certain rpm should power the display. Can you help me?