[Q] SIII 4.3 Update - Data Issues - Galaxy S III Q&A, Help & Troubleshooting

Hi Guys,
Installed the 4.3 update on my SIII a couple days ago - all was fine until today.
As soon as i am away from WiFi and on Data - my phone will display a 3G Symbol or H+ Symbol in the notification bar signifying the Mobile Data is connected - however none of the apps work or update I cannot use the internet or anything that needs data.
A restart of the phone kick starts the data for about 5mins and then back to normal.
Baseband Version
I9300BVUGML1

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Hello guys,
my problem relates to activating WiFi and/or mobile data on my phone.
First of all WiFi:
I'm used to enable it via status bar. But when clicked nothing happens but the symbol changing. When entering the WiFi settings through systemsettings WiFi is disabled. Enabling it there works fine, but is not what I would expect.
Before it worked fine.
Next problem.
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My specs:
Samsung Galaxy S2 (int)
Kernel: Kernel_Siyah-Dorimanx-V9.10-[10-51]-[21-03]-JB-CM-AOKP-SGII-PWR-CORE
ROM: cm-10.1-20130321-NIGHTLY-i9100
Modem: I9100XXLS8
My fiancée and I got the same problem with the mobile data. I updated her phone with the latest nightly to be sure it's nothing that may have already been solved, so she got cm-10.1-20130320 nightly, I have yet to update from cm10, still running cm-10-20121209 nightly.
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I don't use CM anymore, but when I used to run CM9 that happened to me occasionally. Restoring a backup or reflashing the rom & kernel directly over the top of the current instal without wiping (if you're using another kernel) was the only thing that fixed it for me. You may find that reflashing the rom/kernel doesn't work; if it doesn't, I'd do a clean install (wipe/etc; tho I never had to do this to fix this problem).

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First of all i want to clear up some things.
1. My phone is a A5 Smiley from Allview.
2. When i bought the phone i had Android 4.2.2 Jelly Bean
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