TCP Problem

Hi guys, I am creating a kind of Data-Visulizer which receives stream of data over TCP and draws Graphs/Signals on screen using Vectrosity. I have a "Network" class which handles network operations, a "RawPacket" class that encapsulates incoming data. "Network" reads tcp socket, creates "RawPacket" objects of them and finally puts created object in a Queue. A C# script dequeues objects from the queue, interprets and draws data. The major problem: after a while, somehow, my graphs show garbage (spikes) on screen while my data are OK (I have tested). Does anyone know how can I pass data safely from my Network object to drawing object? Oh, data transfer rate is 1~2KB/sec, both client and server programs live on the same machine, packet size varies between 28 and 500 bytes. Since the order of packets is vital, I use synchronized socket operation.