Zorion OS "crashes" for some seconds when I plug a external device (USB, External HDD, things like this).
I don't think it's my laptop resources, it runs fine Zorion, without any lag, but this happens always when I plug something on the laptop.
Not sure if it's a bug from Zorion, or something related to my laptop (Even my laptop is really bad).
This is a not too common Ubuntu issue...
Often, a Reinstall solves it. You might try instead ensuring that in Software & Updates, the Top Four Options on the First tab (for sources) are checked.
Then, ensure that you are set to Main Server (under "Download from")