I have followed the setting mentioned in other posts. I have tried to set up DHCP ip pool. However I'm unable to set a range of IP addresses for the extender like some ppl have suggested. It's not available as an option under any settings. Please help. It's frustrating to restart the extender every few hours 

@Shreyascashyap i have the exact same model of router and extender with same firmware updates. Issue I'm facing too is exactly the same. Gets really frustrating to keep restarting whenever this happens just to see it stop working again after sometime. 

We really need help with this issue. Hope someone comes back with solution

@Shreyascashyap I spoke to the tech support and they suggested the following solution which seems to be working for me.

1. Ensure the extender is updated to the latest firmware version. 

Restart the extender.

2. Got to the routers page (Archer C20 configuration page in this case) and in there go to

Wireless 2.4GHz - Set the below

Mode - 11bgn mixed

channel - 11

channel width - 40 MHz

and save the changes.

Wireless 5GHz - Set the below

Mode - 11a/n/ac mixed

channel - 44

channel width - 40 MHz

and save the changes.

Note - My extender version is V3 (not sure if that changes anything in your case)

Hope this helps

@Premsagar33 

Thanks. I tried your suggestion. It is certainly better now. I still have the issue but its once in 1.5-2 days now instead of once every few hours. My tether app says there's no later firmware at all, dunno how you're on v3 and I'm on v1! 

Hope someone else has a fix for this

@Shreyascashyap 

i have the same issue i have tried a lot of things none of them work it is really fusterating i get amazing wifi when it works but then it just stops and i have to turn it off then on.

I saw that some poeple said that to fix this issue you have to go into the settings for your router and add the mac adress to the aproved list or something like that i am going to try it later hopefully it works.