Thank you for asking your query at DoctorSpring.
I understand these episodes are frustrating for you, but unfortunately often it is difficult to come to a diagnosis easily in scenarios like this. These episodes shows the evidence that there is a functional abnormality which most probably a seizure activity.
Just as a digestive system malfunction can cause heartburn or diarrhea, a dysfunction of the Brain can manifest as strange symptoms. So to answer your question - what could be the cause -- the cause is most probably seizure activity. The diagnosis is best done by a Video EEG and you need to be patient even though it might be frustrating at times. You might need a MRI study with MRV and MRA (study of the blood vessels) to rule out any blocks. Your Doctor might also go for a functional MRI. The good news is that if the cause is found out it can be treated under normal circumstances with anti epileptic medications. Sometimes the symptoms might disappear by its own altogether. This is not life threatening or seriously damaging, however it requires evaluation.
Hope this helps
Please feel free to ask followup questions.