Please find the first bad -rc* kernel between v4.10 to v4.13 from 
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:
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).
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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