I have the same problem (v4)

After resetting,it works for a while but then i cannot access the 192.168.1.1

I have upgraded to last version firmware

Please help how to sove this issue

Also i have another problem :

All of my device connect to wifi, but only one of them access to internet :/

3 of them just connect wifi without Internet.

I have reset modem but does not solved

I have the same problem

I tested with two modems : td-8901N and td-8901G

and several pcs and phones (lan and wireless)

after restarting(not reset) modem, i even can't see this pge

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Object Not Found

The requested URL '/' was not found on the RomPager server.

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and i see this error 

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This site can’t be reached

192.168.1.1 took too long to respond.

ERR_CONNECTION_TIMED_OUT

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i tried updating firmware after reseting modem, but it shows this error (file is not accepted)