i found following msgs in windows log

Cluster resource 'SQL Server' in Resource Group 'SQLVS01' failed.

Timeout (30000 milliseconds) waiting for a transaction response from the DWMRCS service.

Timeout (30000 milliseconds) waiting for a transaction response from the Netman service.

The SQL Server Agent (MSSQLSERVER) service was successfully sent a stop control.

The SQL Server Agent (MSSQLSERVER) service terminated unexpectedly. It has done this 4 time(s).

The SQL Server (MSSQLSERVER) service was successfully sent a stop control.

The SQL Server (MSSQLSERVER) service terminated unexpectedly. It has done this 2 time(s).

The SQL Server (MSSQLSERVER) service was successfully sent a start control.