How to reduce T3000 software freezing?

I found the problem, it’s not the T3000 software, it’s T3 controller (I have T3-BB). Every 5-6 minutes Ethernet connection is falling down for a 8 seconds, then connection recovery (I connect T3 directly to PC). When connection fall down T3000 program is freeze, i think because T3000 always read T3 controller, and when happen trouble with Ethernet connection T3000 trying to connect T3 controller, but happen program freeze.
I install last firmware for T3 controller, but it doesnt help. I found old topic about trouble in connection via Ethernet, but there only help one advice: always send icmp packet by ping.

When i ping T3 controller i dont have any problem with connection. But t’s not very convenient to ping T3 controler everytime, and we have project where 3 T3 controllers have connection via Modbus TCP/BacNET without PC and this means there will be no ping.
Do you have idea how to fix Ethernet Connection?