When I connect my Pegasus 3 via a thunderbold 3 to thunderbolt 2 adapter seems like everything is not working properly. I use the last update in promise utility and drivers like support center mentioned to me before.
The temprature is always high causing fans to make a lot of noise.
The pegasus causes iMac to reboot every since a while.
The pegasus can not sleep and wake with iMac.