I recently purchased an A10. Upon, successfully adding the device to my home network, it has started to add unknown devices. 

How do I know this? 

I deleted all the unknown devices (12), along with the actually known device (A10 x1) from my network. When this happened, zero unknown devices appeared on my network. 

The issue obviously is the new A10 I purchased. Has anyone come across this before?

Cheers

Never heard about such issue. It may be related to your router when exposed to the A10.