Cron jobs sometimes not firing

[svenehlers]

Does anybody else observe that cron jobs sometimes are not firing, even if the same job did fire previously?
The Platform we are working on is an ESP8266 and the cron job should fire daily but i.e. about once in a month it does not.

This is more like a reality check or a potential issue than an observed and defined bug because it is hard to reproduce.

Edit:
We are using version 2.15.0

[ghseb]

@svenehlers Could something like staticlibs/ccronexpr#35 describe the issue you observed?