Heroku is partially down (my site unresponsive)
status.heroku.com
status.heroku.com
Not sure if these things are related.
NetRange: 75.101.128.0 - 75.101.255.255 CIDR: 75.101.128.0/17 OriginAS: NetName: AMAZON-EC2-4
(from whatismyip.com)
Of course its also possible that you just got lucky and Heroku came back up for you when you redeployed. Could be a coincidence.
But the guys at New Relic helped us and fixed the issue, according to them it should not happen anymore.