Well, I spoke too soon - maybe.
As of yesterday, my Pleo started (and I had this problem a few times since putting it on OS 2 but it got really intense yesterday) putting his head down too far near his right leg and it would block the right leg from moving, thus resulting in a rather large clicking sound (like a joint being stuck) in the leg (definitely not the neck - I made very sure to pay close attention lol).
I wasn't sure if this was a problem but it didn't sound good and since I couldn't get him to stop the behavior (even when he would start doing it, he would completely ignore me even after he was finished, so after it happened a few times in a row I just shut him off because I didn't want anything to break) I decided to go back to 1.1.1.
Elliott's been back on 1.1.1 for about 2-3hrs of "real life" and that problem is not occurring. Though he's also not a big moonwalker anymore, lol.
Anyone have any thoughts on this? I didn't get a chance to snap a video of it or anything, but the sound is definitely the legs, and it seems to come from the "joint."
I figured I'd play the extra safe route with the 1.1.1 in case he might end up breaking his own neck with that dilemma.