Mild spoilers for In Search Of Sanity. If you're in my Albuquerque group, don't read this.
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So I'm running Strange Aeons, three sessions in, and one of my PCs is singularly uninterested and uninvolved. He's actually a huge cosmic horror fan, and prior to the game start was by far the most psyched about this AP.
He came up with an interesting character as well - an android who developed psionics as the result of a rhu-chalik getting interrupted reading his mind, giving him a mental collective (he's a Vitalist) and a dormant mental link to the Dominion of the Black (mechanically the Formerly Mind-Swapped trait).
He's played his android very well, too, giving him a disturbingly upbeat voice and occasional lapses in melancholy when Formerly Mind-Swapped produces creepy alien memories. One of best moments so far was when he entered the party Witch's mind to aid in a mental battle with the Witch's sentient Harrow deck.
On the other hand, he's been unhappy about quite a bit. He's consistently complained about not feeling powerful (I allowed him to swap his racial Int bonus to Wis, so he's a primary caster with a casting stat of 20). He changed his archetype between sessions without telling me. He also gets upset and loses interest if his powers aren't immediately useful. During the encounter with the Taxidermic Wings, he simply wandered off and started checking other doors. He was very upset when I ruled Dr. Losandro's mind was too damaged to extract information from (and that he couldn't really do that anyway). After the third session ended, he declared that he didn't care about the survivors, about the other PCs, about fighting monsters, or anything that didn't clearly lead to him recovering his memories, and he ended up storming out.
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So, any thought or advice?