Thank you all of you for replying to this thread with your valuable comments.
I have already raised a request with Airtel regarding the same few days ago, but no response from them so far.
@rajil.s yes, I am using Wi-Fi 6
router to test speeds wirelessly, one thing is not clear, if I am getting 300+ Down, 300 for upload shouldnt be a problem even if its wifi. I will check through Lan Cable once the
USB C to Ethernet adaptor comes.
@Rickysin I dont think its an hardware issue, I changed Lan Port from LAN1 to LAN4. Last I rebooted
ONT was 15 days ago, and the reason for reboot was the same as now. I dont think rebooting it again will fix the issue. And even if rebooting fixes it for some time, its not a permanent fix. ONT seems not to have an issue with memory and cpu bottleneck, I mentioned a pic for that. I will again raise a request with Airtel and see what they have to say this time.
I forgot to mention, ONT is in bridge mode, and
Mikrotik router is being used for PPPoE connectivity and mikrotik gets public IP directly from Airtel's side.