rebuild process hangs..

this code is automated to run everyday.. but only last 2 days it is hanging and thus locking other processes also.. could this code be made more efficient to avoid locks or graciously quit without locking other process, in a failure or delay?
(I believe this is public code from online, perhaps Microsoft)
~~~
USE ROSER
GO
SET NOCOUNT ON;
DECLARE @objectid int;
DECLARE @indexid int;
DECLARE @partitioncount bigint;
DECLARE @schemaname sysname;
DECLARE @objectname sysname;
DECLARE @indexname sysname;
DECLARE @partitionnum bigint;
DECLARE @partitions bigint;
DECLARE @frag float;
DECLARE @command varchar(8000);
 
SELECT
    object_id AS objectid,
    index_id AS indexid,
    partition_number AS partitionnum,
    avg_fragmentation_in_percent AS frag
INTO #CollectFragInfo
FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'LIMITED')
WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0 and page_count>99;
-- Declare the cursor for the list of partitions to be processed.
DECLARE partitions CURSOR FOR SELECT * FROM #CollectFragInfo;
 
-- Open the cursor.
OPEN partitions;
 
-- Loop through the Indexes to be defragged.
FETCH NEXT
   FROM partitions
   INTO @objectid, @indexid, @partitionnum, @frag;
 
WHILE @@FETCH_STATUS = 0
    BEGIN;
        SELECT @objectname = o.name, @schemaname = s.name
        FROM sys.objects AS o
        JOIN sys.schemas as s ON s.schema_id = o.schema_id
        WHERE o.object_id = @objectid;
 
        SELECT @indexname = name
        FROM sys.indexes
        WHERE  object_id = @objectid AND index_id = @indexid;
 
        SELECT @partitioncount = count (*)
        FROM sys.partitions
        WHERE object_id = @objectid AND index_id = @indexid;
 
 
IF @frag >= 10.0
    BEGIN;
    SELECT @command = 'ALTER INDEX ' + @indexname +' ON ' + @schemaname + '.' + @objectname + ' REBUILD';
    IF @partitioncount > 1
        SELECT @command = @command + ' PARTITION=' + CONVERT (CHAR, @partitionnum);
    EXEC (@command);
    END;
 
FETCH NEXT FROM partitions INTO @objectid, @indexid, @partitionnum, @frag;
END;

CLOSE partitions;
DEALLOCATE partitions;