CPU 0 Unable to handle kernel paging request at virtual

Hi

I have a lot of hardware, which at the first connection or speed test, it's reboot.
Then it works, perhaps because it warms up.
Message is:
CPU 0 Unable to handle kernel paging request at virtual address 00000000, epc == 00000000, ra == 00000000

Where could I look for the problem or disturbance ?
RAM ?
CPU ?
Core Power ?
I don't think the flash chip