Why does the detail page periodically break?

Question

1C-Bitrix

The product detail page breaks periodically. As under the administrator, without. Caching is enabled. In the Bitrix forum there is a hint at the mechanism of deferred functions.
Sample page
dev15.ru/spalnye-prinadlezhnosti/podushki/podushka...

Answer 1

At the first inspection, the caching system and poorly configured multisite are striking.
On the reference page (where everything is displayed normally) there is a call to the spead of the error440.ru site .
In this case, if you compare the reference page and the same page, but with unloaded data, it turns out that most of the content is not loaded. I found a discrepancy in 40+ lines.
That is, one of the components (which actually shows the card) is not loaded.

Answer 2

abandoned this pattern. A possible cause of failure is nested components, which were called without a parent object. $component.

$APPLICATION->IncludeComponent(
'bx:component',
'temp1',
array('Param' => '123'),
$component