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Autofocus failure can occur if there are low contrast areas such as a solid blue sky or stretch of sandy beach for instance. Low light subjects would be difficult to auto focus as would backlit and reflective subjects so fill-in will help. It isn't easy to fix focus on repetitive patterns either. At least one of these may well have caused you to lose focus.
Shooting in the midday sun is generally asking for tech problems. Harsh light from the overhead sun can leave images looking flat and lifeless. Shots are best taken in the early morning light or late afternoon if there is plenty of sunshine about, but can also be taken successfully from about 2pm onward. Your manual should tell you all about this by the way, so don't forget to read it often.
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