Event 9001 - log is not available during backups

SQL writer error: Unexpected error calling routine IClientVirtualDevice::GetCommand.  hr = 0x80770004.

I reboot, all is fine for a few days, backups work fine and then Boom, I start getting these errors again. I can't keep rebooting every few days, I need backups to be reliable. VSS in general seems to be fatally flawed, with a single minor error killing the entire system until a reboot, and not allowing ANY part of a backup to proceed due to one minor subsystem failure.

Here is the output of vssadmin list writers:

(C) Copyright 2001-2005 Microsoft Corp.

Writer name: 'ASR Writer'
   Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
   Writer Instance Id: {9b661b56-738d-4853-8512-ab60bfe6d40e}
   State: [1] Stable
   Last error: No error

Writer name: 'SqlServerWriter'
   Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}
   Writer Instance Id: {88029c64-f3aa-4e57-8542-77da948300f4}
   State: [8] Failed
   Last error: Non-retryable error

Writer name: 'System Writer'
   Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Instance Id: {b091ada8-f28b-49b1-b3e3-572227ddea8c}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'SharePoint Services Writer'
   Writer Id: {c2f52614-5e53-4858-a589-38eeb25c6184}
   Writer Instance Id: {d863ec1e-fbc5-4b2a-8465-556e421c6c82}
   State: [1] Stable
   Last error: No error

Writer name: 'FSRM Writer'
   Writer Id: {12ce4370-5bb7-4c58-a76a-e5d5097e3674}
   Writer Instance Id: {51005bbd-02f3-4aea-9aab-ee18b9c06a44}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'NPS VSS Writer'
   Writer Id: {35e81631-13e1-48db-97fc-d5bc721bb18a}
   Writer Instance Id: {739f2abd-c9ac-4343-a653-581753c7ffbd}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'Microsoft Exchange Writer'
   Writer Id: {76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}
   Writer Instance Id: {c37f45ae-9710-4171-91f6-eea6468172da}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'SPSearch VSS Writer'
   Writer Id: {57af97e4-4a76-4ace-a756-d11e8f0294c7}
   Writer Instance Id: {21eda2e6-c571-4a7f-8c1a-8b50bb3d2c0c}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'WMI Writer'
   Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
   Writer Instance Id: {7bf2f68d-a6ec-47c4-a63f-3de29dc25a61}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'BITS Writer'
   Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0}
   Writer Instance Id: {9c90973f-517c-44b8-ba69-e608a191bbe9}
   State: [1] Stable
   Last error: No error

Writer name: 'Shadow Copy Optimization Writer'
   Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
   Writer Instance Id: {c3aeffb3-c2e6-4670-b853-b041c368d745}
   State: [1] Stable
   Last error: No error

Writer name: 'TS Gateway Writer'
   Writer Id: {368753ec-572e-4fc7-b4b9-ccd9bdc624cb}
   Writer Instance Id: {52efe6fe-6286-481b-8af6-8ad470e97f55}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'FRS Writer'
   Writer Id: {d76f5a28-3092-4589-ba48-2958fb88ce29}
   Writer Instance Id: {476a7ae6-8864-4e1d-ad25-0c4b48f3f70b}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'Registry Writer'
   Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
   Writer Instance Id: {714d824b-87b6-4ed8-ad13-c20a8a101e08}
   State: [1] Stable
   Last error: No error

Writer name: 'NTDS'
   Writer Id: {b2014c9e-8711-4c5c-a5a9-3cf384484757}
   Writer Instance Id: {0cf69da9-cc30-4211-b479-105b54d7f554}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'COM+ REGDB Writer'
   Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
   Writer Instance Id: {97dbb7fb-49af-4257-8fd5-0fbeb810e86f}
   State: [1] Stable
   Last error: No error

Writer name: 'IIS Config Writer'
   Writer Id: {2a40fd15-dfca-4aa8-a654-1f8c654603f6}
   Writer Instance Id: {d2762ea3-1814-4658-8138-d5f9b7d1ff71}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'Dhcp Jet Writer'
   Writer Id: {be9ac81e-3619-421f-920f-4c6fea9e93ad}
   Writer Instance Id: {53d8ce60-9a60-42d6-aa29-48f8d534fc9b}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'Certificate Authority'
   Writer Id: {6f5b15b5-da24-4d88-b737-63063e3a1f86}
   Writer Instance Id: {86fedb23-3064-4a9e-9c38-be44dfb448b6}
   State: [5] Waiting for completion
   Last error: No error

Writer name: 'IIS Metabase Writer'
   Writer Id: {59b1f0cf-90ef-465f-9609-6ca8b2938366}
   Writer Instance Id: {9a4d6a02-8a2f-4e21-8498-f469d87eba7b}
   State: [5] Waiting for completion
   Last error: No error