Perform "Interactive checks" for "Bluetooth" first, through Samsung Members app. It's an official means of hardware checking.
To do that, go to Samsung Member's homepage and follow the screenshots below...
If it looks OK after checking then go to device Settings > Apps then click on vertical "3 dots" right sided above then tap on "Show system apps" and find out "Bluetooth" app from search box then tap on "Bluetooth" then go to "Storage" then perform "Clear catch" and "Clear data" and then try. Screenshots below...
Even if it doesn't work then perform a factory reset on your device. Even not, then take your device for servicing to the Samsung authorised service centre.
Please be assured and to resolve "Bluetooth" issue kindly follow the given below steps:
1) Clear cache and data of Bluetooth app data: Settings >Apps >Menu (Three dots) >Show system apps >search and type "Bluetooth" >Bluetooth >Storage >Clear cache >Clear data >OK.
2) Check device in safe mode: Press and hold the Power key, when Power off icon appears >Press and hold the power off icon. Exit safe mode: Hold the power button and select restart on the device. 3) Reset the device: settings >General Management > Tap on Reset. Note: Before reset make sure to have back up of the data via Smart Switch Mobile App (Install Smart Switch App > Open > Click on Memory Card Icon >Back Up option > Choose the data for Back up > Back Up).
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question). Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
