tg01 wp7 keep locking sd card. please help

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hy all
i get success to reflash my tg01 with wp7 tango. i was happy with this real improvement and last days i got a problem when tg01 freezes and boots and when on i got a error message saying that the sd card was locked . i made a search on the forum and i found that i can unlock the sd card with a nokia phone. i have a nokia e90 i tested formating the card on it and this was done . i put the card on the phone he boots like a hard reset phone and he began to install somme aplications and boots with wp7 again. and after a while he freezes and give the error message about the missing sd card.
the phone keep locking the card fter every unloking
please help me i really loved the wp7.
and thanks for every advice

I got same problem before, after i try other SD card, it work for me. No more show up SD card locked.