I had a V300 120GB SSD which after three months stopped being recognized and was replaced by a new one a week ago. Also i bought another one one day ago. The first two had 505 firmware. The third has 506 and is way slower than 505. I tested with CrystaldiskMark and AS SSD and the difference is between 30-80MB/sec!!! (I use SATA2 by the way). Is there something i can do to put 505 firmware instead of 506 or is there a new firmware around?