I have recently purchased a second hand iMac 2013, and since the internal HDD is pretty slow, I decided to buy a Samsung T5 SSD and boot it from there via USB 3.0 port. A couple days after I did this, the computer sometimes freezes randomly. Weirdly, the mouse cursor still moves, but no UI elements can be clicked. Inputs from keyboard is totally ignored. Also, sometimes when the computer is sleeping, I can't wake it up and it just got stuck on the password screen. Does anyone else with setup similar to mine experience this? Is there a way to make this better?