Users frequently notice unwanted behavior and degradation of system performance.

Her family and friends begin to notice odd behavior around the time she falls pregnant with her third child.

In retrospect, friends and family members say they had begun to notice aberrant behavior.

The affair began when some school teachers and social workers noticed "strange sexual behavior" from four children in a local school.

We notice behavior of the water at the critical peak of the hill.

At the same time, he begins noticing strange behavior in Sara, who seems to rotate between friend and foe for no apparent reason.

As the men were ferried back to the States, the attending American psychiatrists began to notice strange behavior.

The brain becomes even more hyperactive around 54 months, and it is easier to notice obsessive-compulsive behavior at this time.

Noticing Varlaam's suspicious appearance and behavior, the lead policeman thinks he has found his man.

He said that after the training he noticed more questionable behavior by other people, too.