Performance warning and disk fragments Sybase

I. 09/23 13:02:30. Performance warning: Database file "C:\Program Files\Servoy\database\assyst.db" consists of 137 disk fragments
```At what amount of diskfragments is it considered this to be problem. Becoz...I cant be going diskfragmenting every day or so. Especially when the databases are in use.

thankx