Summoned Beings Appear But Do Not Listen. Options

I have worked about 5 evokations. I am clearly not an expert. The last time that I summoned a being it appeared in my triangle. 'visibly' for a few moments. I cannot understand why these beings do not listen to me. I will admit that I did not go into details of controling the being ect... such as in the goetia. Perhaps it is these simple details; or that my mind may prevent the intervention do to a lack of understanding of the beings purpose. What is their motivation. Also they appear and do not act... So perhaps I am growing a slight mental illness. However they have worked in the past but recently it has not.

Much the same as in spell work. Is it common to experience ups and downs that come in time and with understanding; or am i just not tapping into myself correctly.

This could be caused by a number of reasons, but I think taking a break may be in order. Get a video game, go to some poetry readings, do something to get your mind off of magick for a couple of weeks and let yourself recharge.