Turns out that an index for the property cq:master already existed.When I went into the query performance tools, I saw that the index was considered old or outdated.So I re-indexed it with the oak index manager and it resolved the issue without needing to increase the LimitReads.

We recently upgraded from AEM 6.1 to AEM 6.3 SP1.While navigating our /siteadmin website tree, some child pages won't load. Our logs show the following errors:20.12.2017 16:00:57.822 *WARN* [10.4.20.30 [1513782057792] GET /content/phonak/hq_en/en.pages.json HTTP/1.1] com.adobe.granite.xss.impl.XSSFi...