This is usually what I'll focus on fixing first.
For example, if that occurs with the cost per ATC.
Start asking yourself questions about what could've caused it.
If not, make sure everything is working properly on mobile/desktop.
Get a free trial of a heat map service, if you can't figure out what's wrong.
Try testing new creatives, thumbnails, headlines, copy, etc.
Refreshing ads is vital to long term performance.
Nothing lasts forever, so always continue to test things.
If you did give the top tweet in the thread a RT to help your favorite Ads wizard get to 10k!
If you have any questions please comment them down below.
If you want more FB ads tips, check out the thread below