Old problems often rear their heads when you are busy.
rear one's head
idiomTo appear and cause problems or stress, especially at an inopportune time (said of something or [rare] someone that is undesirable or unwelcome).
Just as we finished the project, a technical error reared its head and delayed our launch.
Although they believed the long-standing conflict had been resolved, the issue reared its head once more during the final negotiations.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.