3560s Letting me Down!

We had a new network installed around march. To save money, we used the catalyst Express 500s. We setup Cisco phones as well. 7 buildings, all connected with fiber. The data was rock solid, no issues at all, but the phones were another matter, very unstable. So we upgraded to 3560s. Now we are having the opposite problem, the phones are rock solid, but the data is not very dependable. In particular, we have two servers that are connected to different swithces, and the users continue to get disconnected from the siwtches. I have tried hard coding the speed and duplex, and replaced NIC cards and cables. Things go great for a week, and then trouble starts building slowly, and then it gets to the point where people are dropped every 10 or 15 minutes.
Could really use some help!

Thanks Jack for all the questions! My VAR is coming in today, and we plan to open a case with TAC. I will try to answer your questions:
Have not tried pinging from .4 to other hosts and/or clients, but will try. Good idea!
Have tried another physical port on the same switch, no change. There are no errors showing up on the port on the switch that has the server.
I have tried pings from a client on sw2 (ME!) to .4, and the results are fairly predictable, almost all get answered, when they don't, that's when the server "disappears" and we lose connectivity. I am going to double check this today. sw2 is a 3560G with 4 ports of fiber, each fiber goes to a different building (most of my buildings only have 5 or 10 users). Also on this switch is CCM and Unity (voicemail). The swithc's CPU doesn not appear to be busy, but just wondering.
Have tried new NIC, new cable on the server. Generally, the server is less than 5% utilized,m peak of maybe 18%. Not very busy.
I thank everyone on here for suggestions and ideas!! I hope to get this solved ASAP. I am supposed to be on vacation this week...and I am at work!!!
Here is what I would like to do, and maybe some of it doesn't even matter:
I want to change my DHCP server from a 2801 to a Windows 2003 box. Just me, it's easier to change and manage, I think. Maybe you all will tell me diff.
I want to change my data VLAN from 1 to 10 or something else. Even though TAC says it won't make a diff, I want to do it.
I want to change my network #ing scheme from 192,168.1.x to 192.168.10.x. The 1.x is too easy for problems, as almost all wireless switches and such not come up in the 1.x range.
If anyone can think of anything else, I would love to hear it!

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