Inconsistent connection and super slow speed with RTL8723BE
Does your installed version of the driver have this parameter?
parm: ant_sel:Set to 1 or 2 to force antenna number (default 0)
Check:
modinfo rtl8723be
If so, I suggest that you do, in a terminal:
sudo -i
echo "options rtl8723be ant_sel=2" > /etc/modprobe.d/rtl8723be.conf
exit
Reboot. Is there any improvement?