My only other idea so far is coming from the wiki page on wireless
Some users may encounter errors with powersave on this card. This is shown with occasional disconnects that are not recognized by high level network managers (netctl, NetworkManager). This error can be confirmed by running
dmesg -w or
journalctl -f and looking for output related to powersave and the
rtl8723be module. If you are having this issue, use the
fwlps=0 kernel option, which should prevent the WiFi card from automatically sleeping and halting connection.
While I know this is not your card; it is a realtek so I would look further into this using the commands
dmesg -w | grep -i 'rtl'
journalctl -f | grep -i 'rtl'
See what you can find related to powersave and post back.