I would wonder about sensory issues, among other things. My DS10 (I'd have to check scores to know if he has low processing speeds, so I wouldn't say those are a paramount issue for him.) gets overloaded when he's around too many people or even one friend for too long, like spending the night, and he has to decompress before he's fit to be around anybody again. He starts getting emotional, annoying his sister deliberately, bad tempered, spacing out, all those things you mention. Some people react the same way to having to focus on something for too long -- I would say DS is that way, as well, except it's only things he doesn't want to be doing. He's fine playing Minecraft all day long.
