Patience is the solution to situations like this. The topic creator had no patience and jumped the gun on the iBasso DX50 purchase. He clearly knew how this hobby works and was aware of the travesty of an OS experience that is commonly found in most of the Hi-Fi portable players. IBasso also had no patience and rushed the product.
Well, in this case we're talking about something that could damage your hearing, not the typical UI problems. I can't say I've heard of this problem with any other DAP before. I do agree on having patience, though. We should let reviewers go over these things with a fine-toothed comb before buying them en masse. That requires self control.