I had one of my ads approved and disapproved four times within three days. Are you going grazy at Googles? If this is the reliability that Google provides to its customers, I will quite happily migrate to competitors
+1. I'd like to see the ad too, to see if I can figure out what happened.
Here's one random guess. The few times I've seen this before have been when the ad's landing page (destination URL) has been flaky, e.g. the web server is crashing a lot.
AdWords review engineer