I'm not having that issue myself. 2 things to try, make sure Bixby is up to date (open Bixby push the 3 dots on Top right, go to settings, very bottom it has my Bixby tap that to see. Have you tried a restart of the phone?
I had the same problem between Thursday and Friday. Even wiped the cache partition. Didn't work. Then suddenly today it's working just fine. I'm thinking it might have been a rogue app—maybe something that got updated.
I found the solution! It looks like the Bixby Home app is in need of an update. I ended up using a site called Aptoide or something like that. It installed the latest version and everything is good. I updated all the apps, but I would avoid updating Bixby voice wake-up and voice. I had to downgrade because bixby voice wake-up stopped working.