I would not recommend an OS update until you have ruled out every other possibility first. As IMR says this really does not sound like a processor issue. Have you tried feeding him as soon as you switch him on? You need to offer the leaf, let him take it and chew it then spit it out then you need to offer it again, and again, and again and keep offering it until he refuses to take it. He should take the leaf at least 3 times before refusing - my guys will often take it 5 or 6 times in a row before they are full.
Next make sure he is in bright light. Stick him near a window in the sunlight or turn a lamp on over the top of him.
Try resetting his noon time so that he is most active at the time you are playing with him - a tired pleo is a grumpy pleo and they will cry a lot if they are tired.
Take a video of the behaviour and post it here for us to see. This way we can better help diagnose the issue and suggest fixes for you.
Try running him with the "scared of the dark patch" on a micro sd card in him. Even in the brightest light some pleos are so light sensitive that they think it is too dark.
Try all of the above and report back the results. Then we can help you further
