I have the same problem. So please post the fix here if you and the support found it. 

Greetings

~ Andorim

I found some other posts on the internet where other people had the same problem. But sadly no solution.

It might probably not be really common, but i'm not the only one having this issue. Asking for specific details here would allow others to help, too. I don't have regularly access to the router because it is not mine, so it may take some time.

He asked for the MAC address of the modem and requested a video of whats happening. So if someone wants to contribute, probably just send a private message with the details to him, too.

If i find a solution, i'll let you know here.

@Itsame 

@Andorim 

Were you able to find any solution to the freezing problem?

Sometimes I can get into Advanced settings but when I try to update the firmware with the latest firmware I can find on the support page for the VR2100v, the firmware does not actually update. I tried the other firmwares on that page and it did not work either.

Any help appreciated. Thanks.

Nope, no solution yet, but also didn't have occasions to really try out more yet.

Would appreciate further hints too.

Finally i had an occasion to do further experiments.

Inspired by other hints across the internet, i unpluged the phone (from phone1). Didn't work, webinterface still hangs when i try to access advanced settings.

Then i tried to also remove the phone number settings and tada, i could access advanced settings. I also installed the firmware update (now 1.3.0.0.9.1).

Reentered the phone number setting, and nope, advanced settings hangs the interface again (so the firmware update didn't fix this).

Removed phone number again, tada: Works.

Reentered it, hangs.

This is 100% reproducible.

But not configuring the phone is inacceptable. At least it is a workaround although a very anoying one, but not a fix.