Planning - The report generation has failed. Error executing query. The number of cells exceeds the

Summary:

.we have an issue with a report bursting export that we have configured and been sending since last year. since April and May this year . the export of data has been failing due to the error above.Our managed service provider has confirmed they have already tried suppressing missing blocks etc but it is still failing.we have been told this is a system threshold.we are struggling to understand how this threshold works and why it would be successful one day and failing the next when to us the data doesn't seem much larger.

can you help us to understand:1. how does this threshold work and how can we explain to our business user the reason for the sudden failure2. can we increase the threshold?