On you Apache logs we can see the following errors:
/opt/bitnami/moodle/moodledata/.htaccess: AllowOverride not allowed
Got error 'Primary script unknown\n'
And then, seems to be after a reboot, they didn't appear more, are you changing the configuration or something?
Apart from that there seems to not appear more errors.
Also, could you give us the steps you are following?