Distractions, task prioritization, loss of situational awareness, or disorientation.

Bottom line

When a pilot becomes task saturated, there is no awareness of input from various sources, so decisions may be made on incomplete information and the possibility of error increases. Effective workload management ensures essential operations are accomplished by planning, prioritizing, and sequencing tasks to avoid work overload. When a work overload situation exists, a pilot needs to stop, think, slow down, and prioritize.