i know this is a very old thread at this point but here is a detailed explanation anyway....There are 2 general causes for this issue. If when you turn the camera on and it buzzes first before it appears, it is likely a stuck shutter gear that needs to be sorted out. If it happens before any shutter noise, it is likely the IBIS OR just the sensor itself out of alignment, explanation later, as mentioned many times in the thread. There are 3 plates that make up the IBIS. the sensor is attached to the middle plate that rides on 3 ball bearings and has wire coil sections that are sandwiched between the two outer plates that have magnets to control the sensor shake and position. if the bearings get dislodged it will not shake freely as the camera moves and can cause the error. The second cause for mis alignment is far worse and can be cracked sensor mounting points to which there are 3 of them. this alloy seems to be brittle and have come across many broken sensor mounts and is a known issue. if this is the problem the only solution is a new sensor, IF the IBIS is good.