Network losing Connection

I am having a problem with my network.  The network has 5 locations connected with single-mode fiber.  A couple of weeks ago the network started dropping intermittently.  I started pinging nodes throughout the property and I can see every once in a while the ping come back as timed out.  Users will lose connection with the file server.  Does anyone have a clue what I should look for?
ping-problem.doc
CarlotaCopperAsked:
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from_expCommented:
what kind of network topology do you have?
how many (and what kind) of switche do you have.
If we are talking about single fiber line, then check the connections of fiber patch cords, possibly ends are dirty, etc.
if we are talking about several lines having problems in the same time, then possibly we should look at the core switch.
however, I would suggest checking cabling first.
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CarlotaCopperAuthor Commented:
The problem turned out to be a loop in the copper portion of the network.  Thanks for your input.  
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from_expCommented:
oh!
I'm happy you have managed to find the problem!
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CarlotaCopperAuthor Commented:
Thanks, We are in construction and it turned out to be an Engineering flaw on my part.  As I combed through the network I found two loops and the problem was still happening.  Then I found the third loop on Monday.  This loop was the primary cause of all the problems we were having.  It was strange I started seeing duplicate IP addresses spoofing all over the network.  Finally, I just broke the entire network and combed through all the copper jumpers.  Just by chance I unplugged the right one, isolated the problem, plugged that patch cable back in and duplicate IP addresses started showing up again.
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from_expCommented:
hm, haven't got last part of your post... have you found all loops? and network is working smoothly now?
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CarlotaCopperAuthor Commented:
Yes, no errors for 48 hours.  The last part of my post was not written correctly.  As soon as I pluugged the cable back in I saw the errors show up so I removed that cable which fixed the issue.
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from_expCommented:
ok!
I'm very happy for you!
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