I would imagine that you have the filegrowth percentage too high. Try reducing it down to 10%-15%. Seconds thoughts depending on the size of your Log file you should maybe change it to increase by MB size rather than %.
If your Log file is 10GB then a 10% increase is quite a lot of work for SQLServer to do.
Also, check that the disk the log file resides on has plenty of space free.
To change the AutoGrowth property:
- Right click on the database.
- Go to Properties.
- Then go to the Files section.
- Click on either the data or log autogrowth column (Click the ...)
I would also read this article to help you decide on whether you need AutoGrow enabled. Do you even need the transaction log - could you switch your Database to simple
mode?