QB Issue Resolution:

A number of Payroll uses are reporting this issue. Quickbooks will look into it.
Such error occurs only when there is something going on at Quickbooks end. So it’ll get fixed automatically soon.
Still, if you’ll face the issue for a long time then contact the Support team.

Resolution for Issue 'Trying to process a payroll and it shows down for maintenance. No heads up. Is this normal?' available: Yes (Solved).
Source: Intuit Community forum.

Trying to process a payroll and it shows down for maintenance. No heads up. Is this normal?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Payroll uses
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Error Recovery for Payroll uses [Canada]
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Additional Support Options: