Can you please share crash dumps avialable from /usr/local/MONyog/bin along with MONyog.log file.
You can upload to our FTP server:
HostName: gateway.webyog.com
UserName: ftpadmin
Password: webyog123
Also /var/lib/mysql/li258-203.pid' '0' access mode: SFTP server: Permission denied
This means SSH user does not have permission to read PID file, An easy way to ensure this is to add the SSH user to the 'mysql' user group.
I am not sure this permission issue is related to crash.