Editing budget mid-learning resets it 70% of the time — and costs you

Across 30 accounts logging every edit, 90d. Learning phase ends at ~50 conversions/7d per ad set.
— Budget change >20%: resets learning in 70% of cases
— Creative swap: resets ~90%
— Bid change >20%: resets ~65%
— Each reset: CPA ▲ for the next 3–5 days
The penalty isn't the edit, it's re-entering the expensive exploration window.
Read: batch your changes into one weekly edit window. Death-by-a-thousand-tweaks keeps you permanently in learning, permanently overpaying.