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Hi @sidneyhe . What model wifi router do you have?
When you get dropout, any change to the lights on the router; DSL and Internet lights?
When you get dropout, does your wifi device stay connected to the router wifi? Can you login to the router admin?
Does the router have a system log with messages when the dropout occurs?
@sidneyhe . In first scenario, Internet light goes off and messages in system log means a failure in the external network. If DSL light stays on must mean connection to FTTB equipment is ok. Fault might be internal to that equipment. That's only a guess.
Second scenario might be a more severe type of error that the router can't handle.
What is the NDF box you mention?
Do you have NBN FTTB or TPG FTTB?
@sidneyhe . This has some info on the Adtran box (second section).
https://support.tpg.com.au/set-your-tpg-fttb#VX420G2Vg.fastntu
Your problem is certainly something for TPG to fix. Whether they replace the Adtran box, or connect your phone line to a different port on their equipment in the comms room.
Send a private message to a moderator; try kate_
https://community.tpg.com.au/t5/Welcome/How-do-I-private-message-PM-in-the-community/m-p/4093