Does leaving Thailand for a few days reset my 90-day reporting requirement with a DTV Muay Thai visa?

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PRINT OUT THE EMAIL THAT HAS YOUR DTV VISA.

That's what you should do... print it out.

You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.

Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.

Did you apply online?

Yes, 90 day report is a check in, your exit stamp and return stamp starts a new clock

Yes.