I have a Raspberry Pi 2 model B running Raspbian GNU/Linux 7 (wheezy). It has been running flawlessly for months and does a bunch of cronjobs. A few run every minute. Some run Once or twice a day. Just yesterday I noticed some cronjobs did not seem to execute, examing the crontab with crontab -e (the way I always edit crontab) I discovered only the heading comments of the void crontab as it comes on a new instal. All my cronjobs where gone. This is the only clue I could find, in /var/log/syslog

crontab[6088]: (root) DELETE (root)

I have no experince with this and I am stumped.

My questions: What are the reasons this could happen and what can be done to prevent it in the future?

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