[Q] Wifi and 3g issues

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I have just flashed cm7 (stable) onto my phone (was using liteningrom before)

It all works fine except wifi / 3g. I cannot seem to download apps without 4/5 reboots and messing around with settings. Is this a common issue? could not see anyone with this issue for this build.

I was also thinking the change of rom may be the culprit so are there any settings in clockwork recovery that I should have done or do I need to hook phone up to kies to update the KE thing?

Sorry, I am still pretty new to SGS2 custom roms.