SD card 2Go not detected on touch dual

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hi,
i m from france and i had a probleme with my htc niki 16 keys
my card worked without probleme. I dont kwon why but one day my card wasn't detected anymore by the phone. In memoty setting it was wirtten : "not installed". i try everything : format sd in FAT/FAT32 many time with different programme, i made soft an hard reset too. Exausted i send the phone to my seller (it is still guarenty). A week later the phone worked perfectly, they reinstall the ROM they said...
But now the same bug reappear and a dont know what to do !! Does anyone here think that flashing my rom can resolve my probleme !! does anyone did have the same probleme ?? i search in many forums but i havr the feeling that i m the only one with a such probleme ?
If somebody have a solution :
HELP PLEASE