Leupold/Gilmore red-dot scope problem

[pepperbelly]

I have a Leupold/Gilmore red-dot scope mounted on my .45acp. During a match today I lost the dot between rounds. When I looked the dot had moved far to one side, then disappeared completely. I replaced the battery but that didn't help. The diode is still working.
What is the warranty on these scopes? I tried emailing Gilmore Sports but the email bounced back as undeliverable.
Does anyone have contact info?

Thanks,
Jim