Inconsistency and unpredictability are hallmarks of Aspergers Syndrome.  It is not unusual for puzzled parents or confused teachers to wonder why their seemingly content and cooperative child becomes explosive and oppositional for no apparent reason.

Some children with Aspergers are affected by changes in the seasons, schedule changes at school, or anticipation of holidays...to name a few of the triggers. 

Patience, understanding and good detective work are needed to get to the bottom of the sudden change in personality.