Thank you for your question. Here is a link to our guide on creating an A record.
The A record should not change once it is modified, but I would need the domain name to check the DNS and provide a more specific answer.
Also, any time a modification is made to DNS, it can take up to 24 hours to propagate. Until that time has lapsed, you will get intermittent results.
There is no need to remove the under construction page, since you are redirecting to a different server.
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