Both of my Samsung Galaxy Tab S6 devices stopped taking a fast charge on the same day. I have tried multiple Samsung fast chargers and cables and electrical outlets. Fast charging is enabled on both. There is no dirt in the charging ports. When plugged into a charger, both tablets display "fast charging" for two or three seconds, then revert to normal charge. I have tried everything. It seems to me that the only way this could happen is because of a Samsung software glitch. What should I do?