After LPSTOP3 exit, I set DDRMC again.
And I set it with DDRMC_CR00=0x0501.
Then there is the case that DDRMC_CR80[bit8] is not set.
I set it in CCM_CCSR=01, and outbreak frequency increases when I enter LPSTOP3.
When DDRMC_CR80[bit8] is not set, what will be regarded as a factor?