Using meinberg ntp over 40Km wireless network

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http://serverfault.com – We have a network of 10 clients running Windows XP with meinberg ntp. Clients are syncing with two ntp servers over a 40Km wireless network using mikrotik devices. Some of clients are connecting to ntp servers over a hop to hop links. ntp servers are syncing with the Internet. The problem is ntp clients are become out of sync after two or three days. After I restart service everything is OK. I should do this procedure every two days. I want to know is this because of long way wireless link? My ntp conf files are simple: server iburst server iburst Windows time servic (HowTos)