Built In HDTV Tuner - Basic Cable Receiving Premium Channels

First post and definitely a newbie, however I did substantial research prior to this post looking for an answer to my question. I recently purchased a Pioneer Plasma with built-in HDTV tuner. Although I utilize Direct TV I have cable internet service and decided to also use the auto-program feature for the basic cable service. Surprisingly the turner auto tuned 80 HD channels with all the music stations and the vast majority of the premium channel with only coaxial cable and no cable box. Many stations stay on all the time while others will either freeze up half way through a movie or fast forward and even sometimes rewind and start over. Can anyone help with information on how to preserve the HD programming on a constant basis or explain why this process takes place. Thanks in advance.

Wish I could start over but there is no control over it. The On-Demand shows just seem to fill a spot on a random channel from 110-101 through 113-112. Many times a channel will be blank on the first past but will have a premium station on when you scroll back through this series of channels. I assumed the HDTV tuner picked up the channels on auto programming and the channels later received a random signal to scramble the feed. Interestingly, whenever a movie is lost, another movie will fill the spot on the same channel very shortly but not necessarily at it's beginning. Puzzling?