Edge/3G disappear on custom roms.

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Hello, first of all excuse me if my english is not very good. I am posting here because I have a problem with my edge/3G connexion since I have installed customs roms. It always do the same : I install the rom, everything is perfect, but after some hours my edge/3G connexion totally disappears and I can't use it anymore (I tried to desactivate/reactivate connexion but it was useless). I tried various roms (insert coins, cristal pyramid, virtuous..), I have updated my radio but the problem still continues... Someone would have an idea about the origin of the problem??

Have u close the wi-fi?

Of course, when I use the internet I have the message I don't have connexion whereas I usually perfectly receive the edge/3g signal