I think i found why sometimes, BDu stops to sending massages about patrolling and even your patrol of area seams have no effect.
Your patrolling mission is really disabled if the sub-campaign was cancelled.
For instance right now, western approaches sub-campaign was removed from selection at map in my campaign and so my mission seams to be cancelled.
You can find it at top left corner of map where it should be active "sub-campaigns" list.
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