How big is that flash drive and how old is it? If I'm understanding the writeup correctly, the problem appears to be related specifically with the swap space for the esxi OS. I'm assuming it also located on the flash drive?
Flash drive is 8GB (Patriot Extreme model) and is only a couple of years old. AFAIK the swap space is not on the flash drive and instead it uses one of the datastores. I don't think it really has anything to do with the ESXi OS since I can stand up an entirely new VM and it will run with no problems, it's only the original VMs that cause it to crash.