That is normal. The GPP is always doing a balance, which is why I always flip it off and back one. It kinda depends on how long yours lays on the ground before going chatty. Thirty seconds of laying on the ground doesn't bother mine. But I still generally toggle mine off and back on before laying it down by nature. If it does begin chatter, I just do an off and on again.
Yea, it is normal. martin