I have talked to my lawyer and he was telling me to stick at least for about 6 months so that you can prove you intent to stay employed from where you filed GC. Otherwise, you might be charged as a fraud and an investigation might be initiated. I asked if this has happened in the past. He mentioned that it has not happened but the GC was granted so that you would work for the sponsor permanently and although there is no definition of  how long the permanent imply, 6 months will be sufficient enough to prove that you had intended to stay permanently.

Any other thoughts ??