Subdomain on dedicated IP - issue

[EricVis]

I have a domain1.com set up on IP1
I have subdomain set up separately as domain ssl.domain1.com on IP2 (dedicated IP)

1) It all worked until yesterday but today when I ping ssl.domain1.com it returns IP1 instead of IP2

2) When I access https://ssl.domain1.com I get 404, when I access http://ssl.domain1.com I get correct webiste (subdomain)

What is going on? I haven't changed anything, autoupdates disabled
Plesk 11.0.9 Update #61