wifi when unattendet change by itself

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hello,
at first sry for my bad school english, its over 10 years ago...

ich have some problems with wifi turn un in unattendet mode.
ich have change the reg. value

hlcm/bcmsddhd1/parms/htckeepwifionwhenunattendet

from 0 to 1, but when i turn my tp2 in standbye mode it works, but only about 15 up to 30 minutes.after this time the reg entry change by itself !

ich have try to use any tools, like rhodium tools, hd tweak etc... but nothing works.
after every softreset the entry change to 0

at last i have hardreset the tp2 and no programm installed, but it´s the same.

i used the original wm6.5 german o2 rom.

thank´s for some trick or help

greetz neme