Caching Events in Mobile Safari is a bad idea
Posted by Shane O'Sullivan on May 3, 2012
This is because the same Event object is reused, with its properties being updated every time. I presume this is to conserve memory on mobile devices, as it is both in short supply and causes too much garbage collection, the enemy of responsive UIs.
The simple solution is, rather than caching the Event object (a bad idea any as it prevents it being garbage collected on other platforms), take what information you need from it, such as touch coordinates, and cache those instead.