RBR50 occasional disconnects

Thank you for replying.

1. Already disabled: Circle, Daisy Chaining, Fast Roaming, IPv6 
2. Already enabled: WMM
3. Just enabled this evening: Implicit BeamForming, Mu-MIMO
   I had some questions as I read about each of these settings and I'm trying to learn (sorry).  Some sounded like they offered obvious benefits, like Mu-MIMO and beam forming.  Others were less obvious given the problem I'm trying to solve (periodic disconnects).

1. Does daisy-chaining matter/have effect with only a single satellite?
2. Why force short preamble?  Just trying to understand how that would help.
3. 20/40 Mhz coexistence seems like it exists to help _reduce_ interference...why disable that?
4. Why disable Armor?  I guess I'm gunshy to disable security features.

To answer your question, my two wired devices use CAT5/CAT5e, but neither is crucial to me (printer/old PC), and frankly, next time there's a disconnect I should verify whether they are even affected at all, because I'm not sure.  Either way, the wireless devices are what I need to solve for at the moment.

Is it problematic to have the satellite only around 15-16 feet from the router (through a floor/ceiling, they are on different floors)?  Could they interfere with each other?

Thank you for your patience.