MR6400 4G Network dropping frequently have to reboot again and again
I am using Indian Airtel 4G SIM card in my MR6400 model V4, with firmware version 1.10.0 0.9.1 v0001.0. I am facing frequent network drops. As long as I am using the internet, it works fine. However, when I keep it idle, the internet disconnets within 10-15 minutes. The only way to recover is to reboot. I have to keep rebooting the router again and again to restore the lost internet connection. I contacted the local customer support over telephone, they told me try different SIM cards and changed primary and secondary DNS to 188.8.131.52 and 184.108.40.206 respectively. Also changed channel width to 40Hz and channel to 11. None of these solutions have worked so far. I have also tried different permutations and combinations with Airtel APN profile settings. Nothing has worked. Rebooting seems to be the only solution.
Please help ASAP, as I need to do work from home and I am dependent on this connection.