If the data is not being imported right now; switch from CPA bidding to another type until the issue is fixed.
I've run into a lot of cases where the data wasn't imported for whatever reason, and it creates what Googlers call a 'death spiral' for CPAs.
Since Google is working off of bad data, the bid decisions get worse and worse and I've seen accounts take 2-3 months to recover from these issues if its not taken care of immediately.
If you switch from CPA bidding to any other bid type. Then after the data is fixed, if Google imports all the old conversions, you can usually switch back to CPA bidding immediately. If the data is not imported, then its usually best to wait 2-3 weeks of data being imported before turning CPA bidding back on.
In these cases, the larger the account, usually the worse the problem gets. Small accounts can usually recover very quickly; but large ones can take a while.