Been having this problem for months. Started getting a message when playing the Amazon Prime channel that my HDMI cable was bad. Checked the cable and indeed it was an early version. Much to my surprise HDMI cables are now up to rev 2.10. This rev is required if you are connecting to a 4K streaming device. I replaced the old cable with a new Rev 2.10 HDMI cable and have had no issues. No error messages from Prime, and especially important, no playback & fast forwarding issues on any channels.
