@Dandie Hi, This was never fixed for me! One reviewer in Amazon says that EU firmware solved the problem, but not sure which one (country) exactly. Carrytel own modems have a 2.7 firmware that...

@Kevin_Z Thanks for the follow-up. I am not sure what more details than what is said before you are asking but I just summarize what I think is helpful here: The modem that works fine) Hardware...

... the firmware of the modem that works fine is: 0.9.1 2.7 v0025.0 Build 160725 Rel.53791n_CA and I can NOT find it anywhere else in the world!!!

ISP 'A' (the new one) is Acanac and ISP 'C' (the old one) is Carrytel. All the modems show "Hardware Version:TD-W9970 v1 00000001". Next to the barcode in the back, it says "Ver: 1.1", same for all...

I was with ISP 'C' for more than a year using their provided TD-W9970. Recently I switched to ISP 'A' and I have to return ISP 'C' modem. So I purchased exactly the same W9970 modem from Amazon....