serious network issue after upgrading to lollipop - ONE Q&A, Help & Troubleshooting

I have a serious issue after upgrading to lollipop. After flashing the CM12 nightlies and a custom lollipop rom. I could not get LTE signal and my data connection will keep switching between H and H+ with frequent disconnections and loss of signal (exclamation mark).
However when I flashed the O5Q kitkat modem + proximity sensor fix, my LTE signal came back stable with no more disconnections or loss of signal.
Weird issue I must say. It seems like the network I'm using isn't compatible with the CM12 nightlies modems.
Anyone else encounter this issue?

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Hello,
Currently I'm using the Cyanogenmod 13(cm-13.0-20160222-NIGHTLY-bacon). My problem is that sometimes i loose my signal and then it does not connect to the mobile carrier again. If I'm searching manually , it works.
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