Archiving to SAP Content Server/MaxDB: TCP/IP errors when deleting in paral

Dear experts.
We are struggling to get the optimal setup for archiving to SAP Content Server using MaxDB. After running one or more archiving jobs for a few hours we suddenly loose connection to the Content Server, and we need to restart the content server before continueing. We long thought it was the logspace which was running full, but this was eliminated. Now it seems as the error occurs when 4 or more deletions jobs is running in parallel. (Write->Store->Delete).
The run-times on a typical archiving job for about 3 GB data would be W: 3000sec S:40sec D: 12000sec. In general the delete job takes about 3 times the write-job.
Everything seems fine until one suddenly get the TCP/IP error after some heavy archiving jobs.
Have anyone experienced anything like this, and are there any good ideas on how to avoid this?
Thank you very much for your inputs on this.

We were running 3 parallell delete jobs yesterday, and it all went fine until I started the 4th job, then all jobs stopped immediately. The KNLDIAG file at the exact time of the problem looks like this:
2008-10-08 22:57:48      0x918     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0025', UKT:8
2008-10-08 22:57:48      0x918     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0003', UKT:8
2008-10-08 23:31:14      0x918     19637 CONNECT 'vreceive', COMMAND TIMEOUT, T74
2008-10-08 23:31:14      0x914     19637 CONNECT 'vreceive', COMMAND TIMEOUT, T72
2008-10-08 23:31:14      0x918     19651 CONNECT Connection released, T74
2008-10-08 23:31:14      0x914     19651 CONNECT Connection released, T72
This morning I just ran another test with 2 jobs which also failed, and the two job logs contains:
09.10.2008 07:06:41 Archive file 000851-001EC_PCA_ITM is being verified
09.10.2008 07:16:54 Archive file 000851-001EC_PCA_ITM is being processed
09.10.2008 07:16:55 Starting deleting data
09.10.2008 07:36:28 Connection to http://192.1.4.5:1090/ContentServer/ContentServer.: TCP/IP error
and
09.10.2008 07:13:30 Archive file 000851-010EC_PCA_ITM is being verified
09.10.2008 07:20:55 Archive file 000851-010EC_PCA_ITM is being processed
09.10.2008 07:20:56 Sletting av data begynner .
09.10.2008 07:39:28 Connection to http://192.1.4.5:1090/ContentServer/ContentServer.: Time limit exceeded
and the KNLDIAG file looked like this:
2008-10-09 07:11:34      0x914     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0016', UKT:7
2008-10-09 07:11:34      0x914     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0023', UKT:7
2008-10-09 07:11:35      0x90C     53040 SAVPOINT (3) Stop Conv I/O Pages 2119 IO 265
2008-10-09 07:11:35      0x90C     53071 SAVPOINT B20SVP_COMPLETED: 689
2008-10-09 07:12:26      0x918     19633 CONNECT Connect req. (T74, Node:'', PID:4272)
2008-10-09 07:12:26      0x918     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0001', UKT:8
2008-10-09 07:12:26      0x918     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0015', UKT:8
2008-10-09 07:12:26      0x918     19617 DEVIO    Single I/O attach, 'D:\sapdb\SDB\sapdata\DISKD0004', UKT:8
2008-10-09 07:12:26      0x918     19651 CONNECT Connection released, T74
2008-10-09 07:12:35      0x918     19633 CONNECT Connect req. (T74, Node:'', PID:4272)
2008-10-09 07:12:35      0x918     19651 CONNECT Connection released, T74
2008-10-09 07:12:46      0x918     19633 CONNECT Connect req. (T74, Node:'', PID:4272)
2008-10-09 07:12:47      0x918     19651 CONNECT Connection released, T74
2008-10-09 07:31:47      0x914     19637 CONNECT 'vreceive', COMMAND TIMEOUT, T72
2008-10-09 07:31:47      0x914     19651 CONNECT Connection released, T72
2008-10-09 07:47:20      0x914     19633 CONNECT Connect req. (T72, Node:'', PID:4272)
2008-10-09 07:47:20      0x914     19651 CONNECT Connection released, T72
2008-10-09 07:49:01      0x914     19633 CONNECT Connect req. (T72, Node:'', PID:4272)
2008-10-09 07:49:01      0x914     19651 CONNECT Connection released, T72
2008-10-09 07:49:27      0x910     19637 CONNECT 'vreceive', COMMAND TIMEOUT, T70
2008-10-09 07:49:27      0x910     19651 CONNECT Connection released, T70
We have not yet looked at the tips regarding the windows errors, but will do that when we get the possibilty. In the mean time; do you read anything from this above? It looks like when several jobs are crashing at the same time there is one which has the "Time limit exceeded" and the rest TCP/IP error.
Could it possibly be the MAXUSERSESSIONS parameter, or are you still leaning towards something outside the database?

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