Time out in insert statement

Hi every bodyI have a large table (270 G) and i only have insert and select statement over this table. I have a lot of time out but i don't know what can i do for this problem and what to check.The table has a clustered index(primary key) and 6 other non clustered indexes.I have checked the unused indexes by monitoring over dm_db_index_usage_stats during a week ,hence there isn't any unused index.Any help would be appreciated.