issues with www header

Today domains in my reseller account stopped working with a www header in the url. www.mumshomebiz.com is not resolving, but http://mumshomebiz.com is. Similar deal with www.scaustralia.com . http://scaustralia.com is fine . Both were working fine previously and on checking the a records, there are 2 entries , one dealing without the www. header and one with a wildcard. header. eg *.

Subsequently both these sites, which service a number of independant operators, are failing. Most clients advertise their systems with a www to make obvious that it is a URL. Most clients are again going nuts after the problems of the last couple of weeks.

Has there been some further upgrade that has caused this?
 
Both those domains with and with "www" are working absolutely fine for me.

We'll do some more tests to verify that
 
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