Not much detail to go on. Can you provide more information about how your Arc is connected to your LAN, what specific issues your system is experiencing, and maybe some details about the devices that the Arc is supposed to be playing, and your network?

Connected to TV via HDMI cable to ARC port and connected to network via Ethernet cable (have tried wireless connect to network although symptoms/issues are the same). Arc random has been disappearing from Sonos app/network orphaning the sub(gen 3) and 2 era100 surrounds linked to it on the same network. Until now, I have been able to reset the arc to factory and then configure the rest to link to it after, the problem that I run into is that the arc continues to fall off the network, but also after the factory reset immediately fails when an update is supplied to it from Sonos.

How long has this been happening?

A factory reset rarely helps - as you seem to be aware, though you say you keep doing it. 
 

Next time it happens, generate a diagnostics report and contact Sonos. They may see details in the report to help address the issue.
 

If you factory reset, any data - including network settings and diagnostics data gets deleted. 
 

Unfortunately, I have reached out to Sonos support and they’ve hung up on me on phone calls and ended the support session online. Apparently they want nothing to do with this either. Very unfortunate as I am somewhat invested in Sonos with the GEN three sub and error 100 surround speakers at this point. I have not generated a diagnostic report in a bit, so I may have to refresh myself on that and hopefully get someone at Sonos support that is actually willing to do their job and support their product. Hopes are not high that they will have someone competent enough to support their product at this point.