PAD come off from PCB after Rework

Usually too much heat or heat applied for too long

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Many times a pad that has no signal trace going to it will come off. It does happen from heat and time as noted before. Somtimes even the best rework person will remove them. If this can not happen in your situation I would recommend that you use a vavuum device instead of solder wick

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You didn't explain exactly how you are reworking the BGA and at what point the pad comes off. Assuming it's from an iron...

The biggest cause of lifted pads is too much heat. Whether it be the iron temp or the amount of time the iron is on the pad. You should be at the lowest temperature necessary to flow the solder. Treated properly, a pad should be able to withstand several heating cycles, well beyond what you should be doing with rework.

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