I’ve been on FW 2.1.7 on Hardware 2.3 for a long time. The only time I had issues with network drops was when I was running wireless and the signal was way too weak in the garage. Solid inch of stucco is difficult for just about any wireless signal to penetrate.
I have a bundle of cables (including serveral Cat5e) run to the semi detached garage where OS is located but they are in the attic and I didn’t feel like moving everything so I could get a ladder in place. I ended up going with a TP-Link AV1000 Powerline Ethernet Adapter. It took me a while to find an outlet near one of my ethernet ports that was on the same bus bar in the same power box as the garage service panel. I have no issues with drops since plugging directly into the Powerline Adapter.