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This first from netstat -ni show RX-DRP for both 

Iface       MTU    Met RX-OK                  RX-ERR     RX-DRP      RX-OVR   TX-OK               TX-ERR TX-DRP TX-OVR Flg
eth3-01 1500     0      184241747707    0                111870671   0              103782379871  0             0            0             ABMRU
eth3-02 1500     0       89235490191     0                 21345804    0              148776069625  0             6194      0             ABMRU


So, for me still valid point increase the rx/tx buffer from nic eth3-02, simple to fix, and will bring a kickly improvement, after that will be need take  a time to see if the RX-DROP will decrease, and follow the investigation

One important point on interface eth3-02 is to adjust the RX/TX ring buffers to the maximum supported value (4096). This usually helps reduce RX-DROP counters and improves RX/TX performance on the interface:

set interface eth3-02 rx-ringsize 4096
set interface eth3-02 tx-ringsize 4096

save config

Normally, no reboot or cpstop; cpstart is required for this change to take effect.
However, if possible, performing a reboot later can be a good practice.

Reference:
How to increase the size of a ring buffer on Gaia OS for Intel NIC and Broadcom NIC
https://support.checkpoint.com/results/sk/sk42181