Sage launch Koreader failded on 4.31 sage

1.Every reboot,I launch Koreader perfertly,and switch on SSH,exit Koreader,keep reading

after minutes later,I will never launch Koreader till I reboot again.Nickelmenu gives me a popup as attached pic.(SSH service remains normal)

What should i do to fix this???

Koreader Ver:2022.1
Fw ver:4.31
NickelMenu:0.54

2.observe a unstability while I intall Nanoclock 0.11,device randomly crashes.
Sage with power cover.
If power cover removed,it seems normal
really feel BAD:help:

Attached Thumbnails