Okay, then the reason is the very little memory for JDownloader. 230 max is only okay for light usage and not many links in list. You have to increase max memory for JDownloader. Open the existing .vmoptions file in your JDownloader folder and append/change the line
-Xmx512m
This means that JDownloader is allowed to use max 512mbyte
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JD-Dev & Server-Admin
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