DVR Issues

We have had a lot of issues with our DVR, have gone thru all the steps (rebooting, unplugging, etc.) I requested a new DVR but still having the same issues. This usually occurs when there is a recording in progress. We will hit fast forward or the 30-second skip button and one of two things often happens; 1) it takes us back to the beginning of the recording; 2) it takes us live. We have gotten into the habit of checking the time on our recording in case it does happen so we can go back to the spot we left off. Just wondering if anyone else has experienced this and/or was able to fix it?