zoning out can be normal in some people or it can be part of any mental or physical health problem....

general examples...boredom is a normal thing that causes a person to zone out (space out,...) people with ADHD/ADD have trouble concentrating and zoning out, as does people with bipolar, borderline personality disorder, depression, addictions, drug or alcohol reactions, medication reactions, ....

I zone out when I am under stress, its also part of my bipolar disorder, my anxiety disorders, my depression disorders, my PTSD, my Multiple Sclerosis and many other problems too with in me cause me to zone out /space out.

we can not tell you whether this is part of your problems, normal or part of PTSD with in you. only your treatment providers can do that...

my suggestion if this continues to bother you contact your treatment providers, they can assess your mental and physical health and then tell you whether this is normal or part of your mental or physical health problems.