Podcast feed stopped working on iTunes- continues on all else

Hi,
Our podcast feeds stopped updating on iTunes over the last couple of days with the following error: Can’t parse your feed. Invalid XML: Error on line 1: Content is not allowed in prolog.
The podcasts still work on Google Play, etc. and on our app. The feed cast validator shows no issues. There is no content on line 1 obviously so I’m not sure what is going on.
We had a DDOS attack on our website on Friday so GoDaddy setup a WAF for us. I’m assuming the error may have something to do with the new firewall but have no idea of where to begin. Any help would be greatly appreciated.
Thanks!