I discussed my troubles with ADATA Ultimate SU800 SSD several times last year (here, here, and here), but I finally went ahead to send back the items.  I just got a notice from ADATA that I am getting the replacements back from them.  We will see if I get both of them warrant replaced since one of them (256 GB model) happened to be an open box item with the “warranty void if removed” sticker damaged by the previous purchaser (thanks Fry’s Electronics).  They will arrive in the next 2 to 3 business days.