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Is it not working at all after that, or do you really just mean when you try to activate "immediately" afterwards? On my P2 Vari, you can't activate perform some functions for a few seconds after doing/activating certain things, I guess presumably while the camera is "thinking/processing"(out of internal computer/memory resources).
Please report all bugs to Panasonic Support. This way it is logged to be addressed.
Same issue with punch-in/magnify focus as well.