Xiaomi k9 mail losing sound on restart

hi all, i have xiomi poco f3 with miui 13. after a restart of device notification sound are lost. i must after every restart add notification sound new. how can i fix it?

2nd problem is, sporadical after many uses k9 mail cant open, no listing nothing, i must remoive files and import config already new. why?

hope you can help. thanks and regards