I also have a lot of connectivity issues with my RS+.
After feeling inspired by your post, especially #3 (which I can confirm), I tried quite a few thing on my router wifi settings. I run a Synology RT2600ac router.
Here are my findings:
- Use the combined WPA-PSK/WPA2-PSK setting, not the WPA2-PSK only setting. Which is wierd, because looking at the link from the RS+ after successful connection, it indicates WPA2-PSK.
- Setting MU-MIMO must be set to off. Quite unfortunate for the rest of devices on the network, as disabling this feature makes the network latency slower
- Your #2 point I can also confirm, and basically makes having multiple SSID’s saved a huge problem. I removed all the remaining, and combined with the above, I could connect.