Data request failure error occurs as a result of manipulating large amount of data within google analytics. To solve these issues, try applying the following:
– When comparing data, try using shorter date-range
– Reduce the number of segments applied on data, especially advanced segments to reduce time required to generate reports
– Change sample size of data so that it loads data more quickly
– Minimize the number of filters applied to different reports and dashboard so that data manipulation time can be reduced and it takes less time to load.
Fixing above issues will surely help reduce the time google analytics takes to load data and help avoid errors in future