Is the reception of the channels/talkgroups you are recording solid? I'm assuming it is but if the reception is broken, the recordings will be broken.
- I've always noticed the recordings end very abruptly - almost cutting off the last 1/2 second of the conversation; parts missing in the middle for me are usually poor reception
- is the card nearly full?
- the card could be failing / try a new card
Not a Radio Shack fan.....