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ifconfig -a, shows packets are being dropped. What is causing this?

I have a dedicated server somewhere and I just noticed that in 'ifconfig -a' shows me packets are being dropped. Any idea what is causing this? Because I do notice I lose connection to the server once awhile from several locations at the same time.
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Octalys

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This is the output of 'ifconfig', look at "dropped"..

eth0 Link encap:Ethernet HWaddr 00XXXXXXXXXX
inet addr:72.x.x.x Bcast:72.x.x.x Mask:255.255.255.252
inet6 addr: fe80::xxx:xxxx:xxxx:f911/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9235716 errors:0 dropped:2788 overruns:0 frame:0
TX packets:12852398 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:4154089892 (3.8 GiB) TX bytes:3945351250 (3.6 GiB)
Base address:0x4000 Memory:e0200000-e0220000
try check your firewall  by  typing  iptables -L to show all firewall rule.
please post the result.
thanks
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Gabriel Orozco
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We dont have iptables activated.  I am going to check the cables, I also found this in the log this morning.

Oct 17 20:53:28 server kernel: e1000: eth0: e1000_watchdog_task: NIC Link is Down
Oct 17 20:53:33 server kernel: e1000: eth0: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Oct 17 20:53:33 server kernel: e1000: eth0: e1000_watchdog_task: 10/100 speed: disabling TSO
Oct 17 20:53:40 server kernel: e1000: eth0: e1000_watchdog_task: NIC Link is Down
Oct 17 20:53:43 server kernel: e1000: eth0: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Oct 17 20:53:43 server kernel: e1000: eth0: e1000_watchdog_task: 10/100 speed: disabling TSO

This wasnt a maintenance.
ok. now it could be either the lan card, the cable or the switch port... pick your choice and start debugging...