ConleyGood

I figured out a fix for my game. I don't know if this is the case for you, but when using Ocato's Recital I had the spells Ebonyflesh, Soul cloak, and Salamander Skin(Fire cloak from some magic mod). Because you can only have one cloak active at a time the game glitched and was likely dispelling the fire cloak and in the process my summons? As soon as I changed the fire cloak to a non-cloak spell(I assume the glitch would also happen if you had two armour spells), the game fixed itself and my summons no longer despawn. In summary, the fix that worked for me was making sure Ocato's Recital used three different types of spells: Ebonyflesh, Soal Cloak, and Regeneration(A healing spell from a mod). Not sure if this is your situation, but it fixed my game. Good luck

Hey Brazen, I've had the same problem and I'm 99% sure it's ocato's recital. It was working fine the whole game up until the College quest where you clear Labyrinthian. Now, everytime I enter combat Ocato's activates and my summons despawn. From what I've read it seems to be something to do with spell sequencing when using ocato's recital, but currently there is no fix I know of. I haven't tried this yet, but you might try using Imperious - Races of Skyrim and play as an Altmer. When you get the quest reward power Contigency it's basically a better version of Ocato's recital and I haven't heard of any summons glitches. Not sure how much this helped, but good luck