A couple of days ago, my S8's speaker's volume dropped dramatically. Even with the volume set at max, I can barely hear the other person on a call. The sound isn't crunchy, there isn't any static, it's just very quiet. Speakphone works fine, bluetooth works fine, but I need the regular phone option to work, too. The speaker itself is physically clean, there's no debris or buildup. The phone hasn't been dropped, and I haven't installed any new apps. Anyone have any ideas?