Husband Was Taking Notes And All Of A Sudden Seemed

husband was taking notes and all of a sudden seemed unable to write. I watched as he tried to put cap on pen and could not coordinate to do it. I looked at writing and it was scribbled and trailed off. not dizzy, not tired. lasted just a couple minutes and then back to normal. he is 45. recently diagnosed with ankylosing spondylitis and taking Humira injections once every two weeks.