There's so many of us having ATA187 problems. I wish Cisco would do something about it. I'm lucky to have a bunch of 186s so I just replace 187s with 186s.
My apologies for not responding to this when I found the solution (which was a few years ago). The problem was DHCP. I ran out of IP Addresses. After increasing the scope, it worked fine.
I have exactly the same problem. There seem to be a lot of people with a similar problem in the 'Support Community' but no real fix or solution. If anyone can help, please...show switch detailSwitch/Stack Mac Address : 0023.5e0f.da00 ...