Weak NFC - Galaxy S 5 Q&A, Help & Troubleshooting

I been using NFC for mobile payment via Optus Pay which is a NFC enable SIM which integrates with the phone's NFC antenna; this worked most of the time. I also use NFC with Yubikey Authenticate and OpenKeychain and while getting the right spot for the antenna to pick up, it always worked.
I recently changed my battery and noticed that my nfc reception has weaken significantly. Thinking that it was a dodgy battery I've put the old battery back in my phone but I'm still getting weak or no signal. I know there have been several firmware updates and I'm wondering if anyone else has been noticing problems? I particularly trying to use Android Pay but Yubikey Authenticate and OpenKeychain have stopped working (being able to read my YubiKey Neo).
Regards
John
Samsung Galaxy S5
SM-G900i
Android 6.0.1
Build number: MMB29M.G900IZTU1CPK2
Kernal version 3.4.0-9647621

Factory reset didn't help
I just factory reset the phone and installed Yubikey Authenticator and it still cannot read it. While I know the Yubikey is working, I have no way testing the NFC other than with this device.
John.

I have this problem on a S9 after changing battery nfc started working weak also

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Thimage
screen orientation quick fix
can't comment on the 3G problem din really face it
you can try flashing to another rom
Zmey Mod from Belarus! would be a good choice
for screen orientation just install shake n rotate from the market
it's just a quick fix which can settle the problem
Thanks for the shake'n rotate tip! I'll try it!
Never heard of the zmey mod from Belarus. Is it in english or in local lenguage? I'll try to find it anyway.
Anybody out there who's actually had the same network connectivity problem that I've had? Can't be the only one right?
Thanks again,
Thimage
Connectivity recovered
I finally recovered connectivity by looking for the right APN on the web and I found it here:
decibel-elektrobeat.blogspot.com/2011/04/3g-de-movistar-configurado-en-xperia.html
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Thanks. T

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fruity101079 said:
You can't connect to a wifi network or you can't activate the wifi module?
Click to expand...
Click to collapse
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