Packets are being dropped when passing through the PacketShaper.
Verify the following:
The speed and duplex settings are set to same value on the PacketShaper interfaces and the interfaces on the directly connected devices.
Change the interface setting from manual to auto, or if it was auto, then change it to manual, on both PacketShaper and the directly connected devices.
If you still see the drops through the PacketShaper, change the network cable on the PacketShaper.
If you still see the drops through the PacketShaper, set shaping to bypass mode. With this mode, all traffic will traverse through the built-in relays. It is as if you have wired around the PacketShaper.
Note: Make sure that you are connected to the PacketShaper through the console before setting shaping to bypass mode, because when the PacketShaper is in bypass mode, you will be able to access it only through the console. After testing, you may revert shaping to off or on based on your configuration. If you do not see any drops in this step, then the PacketShaper NIC interface has probably become faulty.
If the interface through which you see packet drops is part of the Main NIC pair, then the whole unit must be replaced. If the packet drops are found through a LEM card interface, then replacing just that LEM card should fix the issue.