I’m having issues with my Verizon Fios DVR?

When I’m watching my DVR and fast forward through the commercials 1. it goes backwards to the last scene 2. it jumps 10-20 min ahead 3. sometimes it jumps to the very end and i have to start the show/movie over 4. i fast forward or rewind and it changes to a random channel. It’s very annoying. I googled my issue and lots of people seem to have the same issue and didn’t see much of a solution. Anyone have any suggestions? Thanks.