Your Video is Loading. please be patient. Only during rewind/fast forward through live tv buffer

If I'm watching live tv, any channel, I often get a delay when I fast forward or rewind through the buffer.   It will show a black screen with a circle, and a blue bar on the bottom saying the video is loading, please be patient.   It does this for about 10-15 seconds and then starts playing at the very end of the buffer, not near where it was.   I've rebooted the modem/router, rebooted the Roku (which is how I'm accessing my streaming),  deleted and reinstalled the dtv app, sign out and back in again.   I called Directv.   DTV support resynced the account, but it happened while she was still on the phone afterwards.    I'm using wireless and it shows connection excellent with speed 358Mbps.   It plays great as long as I don't fast forward or rewind.    Any ideas?