iphone 3GS has developed a zooming fault - can you help?

Nigel

New member
My iphone 3GS has developed a zooming fault - to activate the zoom screen I triple finger tape, and likewise to deactiate it, but all of a sudden the zoom has become faulty insomuch as it only increases screen magnification by about 5 to 10% - I have tried resetting the phone, removing all apps, reauthorising etc, but still the problem persists, can anyone help me solve it please?
 
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