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HPOV SD 4.5 escalation rule

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HPOV SD 4.5 escalation rule


I'm running SD 4.5 with Service Pack 23.
I have created DB rule AAA (about):

when Service call is modify
and Modify date (*) is any, schedule validation this for 5 minutes after modify date
and [field1]> 1 minute
[field1]:=[deadline]-30 minutes;

when [field1]<=1 minute I send e-mail.
My problem:
my rule started and running, but some times, at random, for after five, ten times (when [field1] is still >1 minute it have stoped. And I don't know why? May be you help me?