"Destination Host Unreachable" when pinging wireless router

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http://unix.stackexchange.com – I'm a little new to all the intricacies of Linux workings, so please bear with me if this is a dumb question. I'm using Linux Mint 12 and I have an Asus PCE-N15 wireless card, which is running the Windows driver. Anyway, periodically I completely lose my connection, though Network Manager and iwconfig still claim that it's fine. If I ping my wireless router continually, I get something like the following: 64 bytes from icmp_req=2368 ttl=64 time=132 ms 64 bytes from icmp_req=2369 ttl=64 time=1239 ms 64 bytes from icmp_req=2370 ttl=64 time=1098 ms 64 by (HowTos)