I agree if a reboot fixed it this can only be the int32 issue.
I am now using Mb not bytes I am dividing the values by 1024.
I have not had this issue with my maximum 8 days of uptime time, so for a device with only 1 day of uptime that's a lot of swap.
I want FlopSwap to work indifinately not start failing after xyzTB of swap, so I am in search of another way.