I have the same problem.

$ uname -a
Linux IT-001 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux

$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"xxxxxxxxxxxxx"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: xxxxxxxxxxxx   
          Bit Rate=52 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=70/70  Signal level=-33 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2173  Invalid misc:4912   Missed beacon:0

$ apt list linux-firmware -a
Listing... Done
linux-firmware/xenial-security,xenial-security,xenial-updates,xenial-updates,now
 1.157.8 all [installed,automatic]
linux-firmware/xenial,xenial 1.157 all

My card uses this driver, but I don't think it supports the 5Ghz network
mode. Andrea's workaround does not work for me.

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https://bugs.launchpad.net/bugs/1623022

Title:
  Very slow wireless with rt2800pci

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