Please wipe your cache partition and click the RESET button from the quick panel (see the bottom of the first two screen shots attached by you.) (To wipe cache partition: Switch off your phone. Press and hold, power button, Bixby button and volume-up button for 4-5 seconds till the phone turn on and boot into the recovery mode. Use volume keys to navigate to 'wipe cache partition.' Use power key to select and confirm. Then reboot your device. Normally, this will not effect any personal data or settings.) Let me see whether it works.
This really sounds like a strange problem, you may try resetting your settings too. Goto Settings >General management >Reset and choose all three resets one by one (except factory data reset). Please note that this action will change all your device settings and network settings to default (out of box) conditions. (Still there are exceptions for some settings. You will read that on the way)
If that still not works, I have nothing left with me except factory data reset. Just get prepared for that, and do that after any major updates come. You can take the advantage of resetting after an update. Share with us your results. Thank you.