I have this problem that is driving me crazy. I have this USB Ultra Fit 16G that cannot make it work as a Linux Live USB in any possible combination, every time the sasquashfs file is accessed the USB briefly disconnects corrupting the file immediatelly and making Linux unusable. I have tried different distros, with persistence off and on, with legacy boot or UEFI boot, creating the USB from Windows and from Linux, using LiLi, Unetbootin, mkusb, etc, nothing. I even got a new USB from the same shop , brand and model and it has exactly the same problem
The failure occurs right after booting and sometimes after a few accesses but it allways fails. I can read and write large files in Windows without problems.
The HW is HP Envy 360 Convertible with i5 and 6RAM, and it works with other USB brands and sizes, but I like the size of this flash and would like to find the cause.