people who use A55 seem to have no problem with AF tracking, that you said is a problem (even though you haven't even touched the camera)
http://www.flickr.com/photos/sportsphotorob/page3/
http://farm5.static.flickr.com/4126/5004...a839_b.jpg
http://farm5.static.flickr.com/4107/5004...57bf_b.jpg
http://farm5.static.flickr.com/4146/5005...2f20_b.jpg
http://www.flickr.com/photos/sportsphotorob/page3/
http://farm5.static.flickr.com/4126/5004...a839_b.jpg
http://farm5.static.flickr.com/4107/5004...57bf_b.jpg
http://farm5.static.flickr.com/4146/5005...2f20_b.jpg