Q: wifi issues

Note, my wifi router is an ASUS RT-AC68U (http://www.amazon.com/RT-AC68U-Wireless-AC1900-Dual-Band-Gigabit-Router/dp/B00FB 45SI4)), a fairly high end router.  It's < 3 feet from my macbook pro.  I am only using its 2.4GHz band.

1) I stopped using my wifi because it apparently drops intermittently.  I observed that when I used RDC on it, to connect to Window's PC sessions, which is something I do constantly, that the RDC sessions would often stop responding and I'd have to close the RDC session and restart.  On a hunch, I bought a USB to Ethernet adapter and now I never have this problem. 

2) One day, my ISP died and so I tried to use my iPhone 6+'s hotspot feature as a substitute.  The only wireless device that couldn't connect to the iphone hot spot was my macbook pro!  It took multiple tries for it to occasionally even list my iphone on the wifi network list and I noticed that the list was shorter than the other wifi devices.   Regardless, when it did show up it would never connect to it.

Fortunately, I do very little biz traveling so the wifi isn't life and death but of course that is a particularly bad deficiency for a laptop!

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Model Name: MacBook Pro

  Model Identifier: MacBookPro11,3

  Processor Name: Intel Core i7

  Processor Speed: 2.6 GHz

  Number of Processors: 1

  Total Number of Cores: 4

  L2 Cache (per Core): 256 KB

  L3 Cache: 6 MB

  Memory: 16 GB

  Boot ROM Version: MBP112.0138.B07

  SMC Version (system): 2.19f7

  Hardware UUID: C8EE771D-BCA1-5A04-A317-53CFF084F256