I changed to Mode to 11bg, just to try something different. Now it seems to be working fine. This may help someone with similar problem. Thanks for reply.

Hello, Thanks for reply. 1. All devices on wireless loose connectivity. 2. Wired connection works fine. 3. All light status on the router is normal. 4. Devices are connected to the network but no...

TD-8968 looses wireless connectivity on android mobile MI redme note 4 Around a month ago there was no problem. Nothing has changed from my side.