I get that here once in a while with sxt's, usually caused by water. Dry it out, clean the reset pads and everything along that circuit trace. If it has a reset button, check it with an ohm meter. Have used clear nail polish to protect the traces after fixing the problem (make sure that it is not conductive).

thanks,
i wrote to a person has experience in it, he said to me that i shuold replace flash ic?