Timeline speeds up when watching

I confess this is my first day trying to figure out Davinci Resolve. I have experience with Adobe Premiere Pro and would like to switch to Resolve as I am not happy with the monthly subscription rates of PPRO. Why is it that when watching something on the Timeline it plays for about 1 second and then speeds up considerably. I haven't been able to find any documentation on this. I assume I should be able to watch it in real time just as I do in PPro. I am using the free version until I am sure I want to make the investment. Any help would be appreciated. Thank you!!
.....Gord
.....Gord