Have you made sure that your Kindle Fire has been updated - Amazon update page here.
Have you tried resetting the Kindle - press and hold the start button for 20 seconds then release it. It should re-start. Wait 5 minutes and try to connect again.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
What’s happening in VR right now: From psychedelic art to combat therapy
Siri not working? Try these troubleshooting fixes
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.