stm32l0 with lptim generate PWM + RTC every 10 sec and stop mode

hello,

I am using stm32l0 in low power mode

configure RTC to wakeup from stop mode each 10 sec , I use LPTIM to generate PWM

my problem is that I noticed the led is starting to blink for every 10 sec +- after a while

what seems to be the problem? ( I want the led to be on all the time not to flash)

Thanks

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