Welcome to our Support Community! Wow, you've tried a good amount of troubleshooting steps to get your data working again. If you're still not able to access data on your S8+, follow these steps. If the steps I provided do not fix your data, the last step directs you to Contact Us as we may have to work with our Engineers or simply refresh your signal on our network.
Does data work normally outdoors? If yes than it is the building and chances are when indoors you are connecting to band 12 which has a limited amount of bandwidth that it can provide.