Review on ProCase Samsung SM T800 SlimSnug Exclusive by Eric Rios

I bought this for my Galaxy Tab-S 10.5 SM-T800. When opened like a tent, it will collapse if not held. Once it moves slightly from that open position, the screen goes black. The seller sent me another unit and refunded me for the first one (didn't want it back). It was exactly the same. The seller also returned the money for this device as he did not want to return the case again. I have a case from Fintie that has been working great for a few years but has worn out. They are no longer manufactured for this model. The cases are almost identical, but this new one folds in a slightly different place, making it unstable. I can't figure out that the screen dims (it should only be when the magnet reaches the closed position). The seller replied quickly and honestly, but the case(s) are unusable. I'm looking for ANY replacement that actually covers the screen when closed.!