Please find the first bad -rc* kernel between v4.10 to v4.13 from [1]
that has this issue, thanks.

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  Poor wifi signal with RTL8723BE and 4.13.0-32 kernel

Status in linux package in Ubuntu:

Bug description:
  When using Linux Mint 18.3 alongside with the 4.13.0-32 kernel the
  wifi signal is really really poor (while almost sitting on the
  respective router) whereas with the 4.10.0-38 it works like charm.

  I had to use a configuration file for getting the wifi to work
  properly (/etc/modprobe.d/rtl8723be.conf: options rtl8723be fwlps=0
  ips=0 ant_sel=1) but chaning the antenna from 1 to 0 did not change
  anything with the 4.13 kernel.

  I am also running Manjaro Linux with the 4.14 kernel on my machine
  where the wifi is also working just fine (with antenna 0 though).

  cat /proc/version_signature:
  Ubuntu 4.10.0-38.42~16.04.1-generic 4.10.17

  (I tried using ubuntu-bug linux but it didn't work [The report belongs
  to a package that is not installed.])

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