QB Issue Resolution:

Delete the estimate. You don’t need it any longer. Or there is a send tag turned on. Why it keeps sending, I have no answer. I thought converted estimates simply evolved into the invoice when converted by Convert Estimate to Invoice

Resolution for Issue 'why does an estimate resend itself on a monthly basis?' available: Yes (Solved).
Source: Intuit Community forum.

why does an estimate resend itself on a monthly basis?: 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.

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