iPhone 6s iOS 9, zoom turns off automatically. How can I stop this?

[iMore Question]

iPhone 6s ios 9, zoom turns off automatically

Zoom randomly turns off-annoying! Could app or malware be causing this? Which ones? Zoom turns back on fine in settings. Help!

 

[Just_Me_D]

Re: iPhone 6s ios 9, zoom turns off automatically

Have you tried updating from iOS 9 to the latest official iOS version?