The SharePoint 2010 VSS Writer service keeps becomming disabled...

SBS2011 ... fully patched
The Sharepont VSS writer (SPWriterV4) keeps becoming "Disabled" ... not just stopping.

I detect it and run this as an admin:

sc config SPWriterV4 start=  delayed-auto
net start SPWriterV4

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But in a minute, I'll have a series of Event Logs like:

Log Name:      Application
Source:        VSS
Date:          22/12/2012 16:52:05
Event ID:      8230
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      MONTY-SBS2011.glcomputing.local
Description:
Volume Shadow Copy Service error: Failed resolving account spfarm with status 1376. Check connection to domain controller and VssAccessControl registry key. 

Operation:
   Initializing Writer

Context:
   Writer Class Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
   Writer Name: Registry Writer

Error-specific details:
   Error: NetLocalGroupGetMemebers(spfarm), 0x80070560, The specified local group does not exist.

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I get a about 10 of those (different "Writer Name") ... then it stops and becomes Disabled.

I've tried this MS suggestion:
http://support.microsoft.com/kb/2537096

And re-doing the passwords like the first suggestion here:
http://www.thirdtier.net/2011/07/when-sharepoint-companyweb-503s-on-you-heres-how-to-fix-it/

Any other suggestions?