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STM32L152- sometimes problems with wakeup

Question asked by kneissl.andreas on Jul 23, 2015
Latest reply on Jul 27, 2015 by kneissl.andreas
After working our instrument goes in the sleep-mode (__WFI) to save power. With a key, which is connected to the Wakeup-pin, we can switch back in the operation mode. Sometimes this function does not work. In this case the CPU is in a strange status and we have to disconnect/connect the battery.
I suppose that CPU is still running in internal ROM (may be internal Bootloader), because I can stop debuging at address 0x1ff008fe.
I don't generate a reset to invoke Pin BOOT0, BOOT1.
Have anyone an idea for this behaviour?