Android JB 4.1.2 snyc problems with screen off - Android Q&A, Help & Troubleshooting

I'm having a little (and simple to reproduce) problem with my Samsung Galaxy S2.
When on 3G data connection, about 5-6 minutes after the phone locks with the screen going off it will stop synching any kind of data. It won't receive any incoming messages from Google Talk, Gmail, Heytell or any other similars. Randomly after several minutes it's like the phone wakes up, checks, and receives all incoming messages all at once.
Also it will receive it all when I unlock the phone and I have noticed a little pattern in the antenna signal icons where they go from blu to white to blu again and then the magic happens.
Do you have any hints on how to fix this or make at least more bearable?
When on wifi there is no problem at all and all messages are synched instantly.
I have used a few custom roms (resurrection remix and revolt both with android 4.1.2). I have tried to change modems and kernels with no luck.
I believe it is a problem with jb 4.1.
Is anybody having the same experience or could give it a try?
Thanks in advance.

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