CakePHP Pages Occasionally Losing Layout - Please Help!

I have a CakePHP site whose homepage is cached for 10 minutes at a
time using Cake's default options. However I've been alerted that
"every once in a while", once a day or so, it's losing the layout,
just displaying the page content without the header, styling etc.

Removing the cached version and regenerating the page apparently fixes
the problem. But why would/could this be happening in the first place?
I can't say I've seen it happen myself (in any of my CakePHP projects)
but asking around on the internet, other developers say they've
definitely seen it happen, usually only in development - but that's
still a big cause for concern, especially as no-one seems to know
why....

Many thanks for your help!

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