Have you tried Settings Apps, then from the listing click on the individual apps and see if you can use the option move to sd card this will free up space in the internal ram, which is the most likely source of the problem
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details