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Please describe the waviness in detail. Is it
- the image chopped up or jumbled up?
- the focus lost?
- the image distorted, parts of it moved relatively to other parts?
The miniDV recording portion of the camera is most likely to have a problem, though it might be other parts.
If the image is chopped up or jumbled up, it might be a problem with higher digital functions in the camcorder, or perhaps a matter of the recording mechanism doubtfully.
If the image focus is lost, that is a matter of the autofocus area (perhaps) changing rapidly when either the camera or the subject moves, or at any rate a problem with the autofocus function.
If the image is distorted, that could just be a problem with the recording mechanism that puts the image onto the miniDV tape.
How old is the HXA1 camera in question? if it has been running on the same batteries or battery pack for a while, you might possibly have a battery/batteries that are getting weak. Rechargeable batteries do get weaker with time, and eventually fail to deliver enough power to start up a device like a digital camera; they then need replacing. The replacement battery needs to be charged up for 6+ hours before its first use, owing to its having been on a shelf for a considerable time.