Do you see anything in InfluxDB logs?
Put the influxdb add-on into trace logging (maybe logging to a separate file) and see if there is something going on during this down time.
See Log4j2 Sample Config for how to do that.
Hmmm. You are using only cron type strategies. I think @unparagoned might be on to something.
Try this. Change the first zeros on all of your cron expressions to a different number so these don’t all run at the same time. Perhaps you are running out of scheduling threads. It seems unlikely but without further information it’s the only thing that stands out.
NOTE: I assume FF is a Group. If not then the * isn’t doing what you think it’s doing. * means “All members of this Group”, not “All Items whose name starts with FF”.