Your possible scenario is really good!
I asked the ISP serveral times,if there are any schedules - but they denied this.
But indeed the do backups, so they must have some scheduls.
And now i also remember the webalizer statistic page shows an timestamp of 05:51.
Which is exactly in the problematic time range, perhaps this is reason for.
i will send this all immediatly to ISP
thanx
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