ReTerminal screen blank after reboot

This issue does not occur at first. When I use it for a long time, when I restart the OS, the LCD is definitely not displayed. The LCD will display normally when booting from power off.
I suspect it is related to the heat generation of the product.

Product lot: 11/03/21
I flashed using the image below.
2021-09-14-Raspbian (modified)-32-bit

I consulted Seeed Japan about this issue, but it doesn’t occur in their environment, so the cause was unknown.