Are you able to get your hands on a USB WiFi adapter to see if that also has the same problems?
It might also be worth checking to see how the Laptop behaves if you connect it to the router with an ethernet cable and disable WiFi.
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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