Should I be concerned that w/who reported 0 users?

[Patrick Wiseman <pwiseman@gmail.com>]

Hi:

I manage a virtual machine remotely, running Debian stable. Recently,
both 'w' and 'who' were reporting zero users. The machine had been up
for 141 days, so I did 'sudo shutdown -r now' and returned to it a few
minutes later, when 'w' and 'who' reported appropriately. Is this any
cause for concern?

Thanks
Patrick