Hello,
I have a similar problem, 1 Lenovo W500, T530, P50, all the boot sticks work maybe about 5-6 times, then it doesn't work anymore, you then have to clean the stick with diskpart, recreate it, then it works again 5-6 times, regardless of whether Wim Boot or Normal Boot. I suspect it's generally due to the Lenovo BIOS, UEFi, unfortunately, so I have to continue using Yumi. Yumi EXfat with Ventoy Bootmanager doesn't work either, so it can only be due to the Lenovo BIOS, UEFI. everything possible has already been tested.
see also
https://forums.ventoy.net/showthread.php?tid=1268
I have a similar problem, 1 Lenovo W500, T530, P50, all the boot sticks work maybe about 5-6 times, then it doesn't work anymore, you then have to clean the stick with diskpart, recreate it, then it works again 5-6 times, regardless of whether Wim Boot or Normal Boot. I suspect it's generally due to the Lenovo BIOS, UEFi, unfortunately, so I have to continue using Yumi. Yumi EXfat with Ventoy Bootmanager doesn't work either, so it can only be due to the Lenovo BIOS, UEFI. everything possible has already been tested.
see also
https://forums.ventoy.net/showthread.php?tid=1268