Crossposting, I put this on the review thread by mistake:
Ok guys, this happened to a friend of mine.
He purchased Megatron and displayed it for 20 days with the right cannon hand, the huge one.
He noticed it was bending forward more and more, and after inspection he found a crack right where the bust connects to the legs - it seems that the area around the slot is not solid, and could have favored the bending.
Anybody else experienced this issue?
Here a few pics: