My STM32F105RB stop running

[WPong.1]

I uses STM32F105RB for my project. I use USART1, USART2, USART3 and UART4 to receive data from sensor. everything works normal. But after 2-3hours it stop running. I check Fault Reports it shows Memory Manage Faults and Bus Faults at some address and Faults address change more than 1 address (Fig.1). When I stop program, it shows program stuck in system_stm32f10x.c in this function

while((RCC->CR & RCC_CR_PLL2RDY) == 0)
{
}

 Can HardFaultException solve this problem ? If it can plese suggest me how to use it.

Thank You very much.

[Tesla DeLorean]

So like it​ resets and gets stuck waiting for the PLL to start.

Got a watchdog running?

Could you perhaps​ instrument the Reset Handler to indicate secondary entry?