Receiving a message now that Itunes "Can’t read your feed. Connection reset"

I checked your feed in Podcasts Connect and it said 'Prepared for submission' which is odd, as it's up in the Store and working perfectly normally. I can only conclude that Podcasts Connect is having a hissy fit, and you should ignore it. You can't validate your feed once it's been accepted anyway, and so it's only the statistics (which are dubious anyway) which may be affected. iTunes is habing no difficulty reading your feed. You should be able to add new episodes to your feed - all you need to do is add them and re-publish, you don't need to get involved with Podcasts Connect to do this.