None of my devices connects to 5GHz on VR1600v

[Ganasg]

I have been with TPG since July 2018. About a month ago I noticed 5GHz dropping out. TPG technician visited and said router was malfunctioning due to a firmware upgrade. Connected a spare ASUS that I had and left. Replacement VR1600v arrived and same issue. 5GHz works for a few minutes after a reboot and then doesnt. I can see the SSID at all times. Incorrect password error comes up. I've tried changing channels to non DFS. I've tried factory reset. No luck. Two replacement routers same issue. 

TPG now tell me that everything looks fine at their end ! WTF !! 5 iOs devices and 2 WIndows devices all have the same issue ! And this has begun only since a month. 

Any solutions or should I just give up on TPG ?

[peter_k]

Welcome to TPG Community,

Could you PM (Private message) me your customer ID, username, service address or mobile number so I can check the status here.

To learn how to send a private message, click here.  

Regards,
Peter

[PeterW]

Hello Ganasg,
Thank you for your message and for being a part of the TPG Community.
For verification purposes can you please send me a private message (PM) by clicking on my name and provide the following information:
• Username
• Full Name
• Full Address
• D.O.B.
• Telephone No.
I will reply ASAP on receipt of the above.
Regards
PeterW
How To Private Message within the TPG Community:
https://community.tpg.com.au/t5/Welcome/How-do-I-private-message-PM-in-the-community/m-p/4093#M45
My TPG app for IOS and Android - https://www.tpg.com.au/download