The one time I saw the 'bad_httpd_conf' error here, it was resolved by removing the domain in the Web Panel and re-adding it.
Having said that; My problem at the time was not intermittent, the error occured 100% of the time.
The intermittent nature of your issue, and the fact that you have recently been moved between servers, suggests that you may be experiencing some kind of DNS propagation issue.
My advice would be to sit tight and wait, the issue may resolve itself.
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