I'm having troubles with whatsapp voice or video call. the moment i recieve or initiate a call it will establish a good connection for the first 5 t0 10 seconds, then it will disconect and connect again after 5 seconds approximatly. the same will repeat agaian after some minutes of talking.

i had a browse on the internet and i disbales the UPnP still the problem exists. just now before i sent this message i increased the dhcp lease time to 2880 mintes and i have upgraded the firmware version of the router.

any possible solution for this?