Safari on iPad occasionally doesn’t recognize ASP.NET postback links

I’m having a really hard time pinpointing the source of an intermittent problem in an ASP.NET web application running on the Safari browser on a third-generation iPad running iOS 6.0. What happens is that, on occasion, the that <a> tags set up as hyperlinks that do postbacks via JavaScript will suddenly stop working and don’t appear to do anything if you touch them on the screen. These include an asp:LinkButton control that is set up as a logout link, and the header row of a GridView that is set up to allowing row sorting. There seems to be no rhyme or reason behind it – they will work as normal for awhile, then stop, and I’ll later notice that they start working again (mostly after closing Safari and re-opening it, though that doesn’t always seem to work).