If RPM drops, do you check ads.txt before changing ad placement?

Asks whether publishers should rule out authorization warnings before layout tests.

When RPM drops, it is tempting to move ad slots immediately. I would first check warnings, ads.txt reachability, seller ID spelling, consent status, and whether the same page group changed traffic mix. If layout and authorization are changed together, the next chart is hard to interpret. Do you check ads.txt and crawl status before changing placement?