Mobile Data suddenly not working. - Sony Xperia M2

Hello Fellas,
I've got a rooted Sony Xperia M2 Aqua (D2403) 5.1.1 Lollipop. Well as you can read in the Headline my mobile data won't work anymore. The "LTE" (or any other) Symbol won't show up after I turn on my mobile data, as if I didn't turn it on. This just happend randomly last Tuesday after I turned on my mobile data. The LTE Symbol showed up for about 2 seconds and then it disappeared. I already had a look at the APNs. I also contacted my carrier, they said its the Smartphones fault. It has to be the Smartphone because the SIM (the mobile data) works fine on other Smartphones.
I have a modded TWRP Recovery made by linuxct from this Thread: "(UNLOCKED BL) ROOT Sony Xperia M2 on Android 5.1.1 [FULL-ROOT]"
And The Bootloader From this Thread: "[UBL][NOOB-Friendly] Xperia M2 Bootloader Update FTFs (New update available)"
I hope there's somebody who could help me.

Update: To anyone who has the same Problem.
Boot into recovery and restore the system section from an older Backup. Worked for me. Don't forget to make a Backup before flashing the system section.

i have the same problem for ages (at least since the official lollipop update, but maybe even sooner). the data stops working when i turn it on. i need to restart the device, put it in and out of airplane mode or make a phone call, then data works again.

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