Can anyone advise what can i do to solve this problem? Thank you.

  @gingel 

Hi, I think TD-W9970 might have bad compatibility with your internet service provider.

May I know who is your internet service provider?

Would the DSL light on 9970 keep flashing or turn off during the disconnection?

Some suggestions you could try:

1. Enable Bit swap and SRA under Advanced>Network>DSL settings.

 

My other advice would be to leave 9970 aside and stick to the ISP modem since when 9970 is in bridge mode, it works with no difference from the ISP modem.

 

  @Heidi_Alp 

 

Hi,

 

Thank you for the reply.

 

My internet provider is Bezeq (I'm from Israel).

 

During the disconnection the DSL light is on (Not flashing).

I already enabled Bit swap and SRA.

 

The ISP is providing a router/modem for a monthly fee, and also you can't switch it to bridge mode.

With their Router/Modem you can barely open ports, and you can't access all the other settings.

That's is why i prefer my own equipment.