I suppose it is possible with some that it is an install issue, however I've done all the wiring myself for my 3 Hoppers and 2 Joeys. The MoCA bars on all devices are 4 bars (anything less is unacceptable.) In the TESTS/COUNTERS menu all devices show 200+Mbps, which would indicate no wiring issues. Satellite signals are at the right levels on all 3 Hoppers, again indicating no wiring issues. All linking issues on my devices as of S213 and S265 are easily fixed with a simple reboot of each problem device. Then, after such, everything is jiffy until the next nightly reboot. Sometimes no devices have issues seeing each other, other times multiple devices have issues, other times only 1 has issues. Again when the issues occur all counters and status bars are where they should be. Technically the devices ARE in in fact seeing each other however there is a software issue in which they do not show up in the "Whole-Home" menu until a reboot.
Perhaps there is a chance that a few people have bad installs, but I believe a lot of those that say S213/S265 are causing issues, because I have personally experienced these issues. That being said, I am glad that a simple reboot will fix it, however it is annoying. At least it only happens after the nightly reboots. Once I reboot again, they have no problems whatsoever, until the nightly reboot. I have witnessed it myself, where I check the "Whole-Home" menu right before the nightly reboot, then it reboots after I tell it yes, then suddenly not all devices show up in the "Whole-Home" menu after that reboot. I then proceed to reboot it again, and what do you know, suddenly all devices are present again. Never had this issue with S212/S264, so that would lead me to believe that it is a software bug.