Hotfolder stops scanning for new files in target directory

Hotfolder does it's job very well, glad i found this program. Only one problem, then i start it it works and prints files. But later it stops scanning for new files. I have to click stop->start then he goes it's job. If new file arrives 30 min later it's 75% i'll have to stop start program. Sometimes it works...

Hotfolder is scanning a folder in dropbox/apps.
I'm running windows 10