2 of my computers drop off my account every time I reboot

Specul8

Hi all. Every time I reboot 2 of my computers, the computer record in Team Viewer goes from active to passive, but never goes active again. It's like it changes the underlying ID each reboot?

Seems to have started recently (like within the last few months) - At first I thought it was a glitch, but it sems pretty consistent (These 2 computers are a laptop which is either on or on standby, but rarely rebooted - and a media server, which is also rarely rebooted).

Thanks!