Default Problem with Samsung Galaxy S2 Cellular Data

I have a issue where when I'm using Cellular data, it will just cut off responding for like 15 seconds and switch back to 3g then H even sometimes where the App itself is requesting data. Any reasons why it would do this? I've done flashing modems and changing the network modes but it doesn't help at all.

Specs:

Samsung Galaxy S2 GT-i9100 on Cyanfox 2.0.2 Nightly 4.4.2 Kitkat.
Kernel Dorimanx 10.43 V92 Compuntio
Running Optus network if you wanted to know (In Australia)

Sometimes even the cellular data connection would cut off completely and would require waiting for like 30 seconds or turning the cellular data off and on to fix it.