Wifi and Bluetooth not working simultaneously

Solution 1:

First of all, you have made a few driver parameter selections for iwlwifi, a wireless driver for Intel devices. You have none; yours is a Realtek.

While the parameter selections do no harm, they are needless and merely take up space. I suggest that you remove them.

sudo rm /etc/modprobe.d/iwlwifi-options.conf

Second, I shall be very surprised if the device doesn’t support 5 gHz channels; let’s confirm:

sudo iwlist freq

Does your router support 5 gHz?

nmcli device wifi list

If so, I suggest that you rename the 5 gHz band in the administration pages of the router, something like redhu5 or some such and connect to it instead.

Next, you tried ant_sel=2 with no success. Please try ant_sel=1:

echo "options rtl8723be ant_sel=1" | sudo tee /etc/modprobe.d/rtl8723-ant-sel.conf

Reboot and see if there is any improvement.

Finally, as has been suggested, try setting a fixed channel in your router, either 1, 6 or 11. After making any change, reboot the router. See if any of these brings improvement.