Are you getting a message from the Google AdWords console that reads, "The keyword phrase doesn't currently trigger any of your ads"? If so, that might be a sign that your account is under review and you may be banned soon or currently.
A Google AdWords Help thread has an advertiser reporting this issue, where AdWordsPro Sarah said:
If this message does not clear up in a few hours, it may be that your account is under review. If this is the case, the best thing to do is to contact support using the process outlined below. If you go through the 'Cant see ad' category, you should get to someone on our support team who can help you sort things out.
Forum discussion at Google AdWords Help.
