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LSE OSC Fail in STM32F107

Question asked by maddah.hamidreza on Nov 27, 2016
Latest reply on Nov 29, 2016 by Nesrine M
I am using STM32F107 with External 32KHz crystal and backup battery in my product.
sometimes in power on, after:
then wait for LSE readey :
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
The program stay in the "while"
The problem won't solve, till , I power off the board and remove the backup battery.
Is there any solution to work LES without removing the backup battery?
Best Regards