TrueNAS Jails losing network after multiple days

[Uranium Donut]

All of my running jails lose their network connection after multiple days (usually 2-3 weeks) while maintaining functionality.

• The jails continue running and can be accessed via webconsole
• Jails are all setup via VNET
• ifconfig shows that "everything is fine" and the jail has the IP it needs (for example 192.168.178.75)
• ping to itself (192.168.178.75) works and replies
• ping to gateway (192.168.178.1) does not work
• ping to TrueNAS host (192.168.178.2) does not work
• restarting the jail in webconsole gets stuck infinitely
• restarting the jail in console (iocage restart jailname) gets stuck at

Code:

root@truenas[~]# iocage restart hass
* Stopping hass
  + Executing prestop OK
  + Stopping services OK

and does not change further​

• I have looked through similar issues in the forum 1 2 3 and have made (software-based) troubleshooting attempts to fix it:
  • Set a static IP for TrueNAS host and jail -> not fixed
  • Enabling "Disable Hardware Offloading" -> not fixed
  • Router Firmware can be broken -> Firmware Rollback on Router -> not fixed

If you guys have some troubleshooting steps, that would be insanely great!

Setup info:​

i3-4160​

12GB DDR3​

TrueNAS-13.0-U5.1​

5x1TB HDD Raidz1 on external SATA Card​

2x128GB boot ssd mirror​

rtl8111e NIC (this might be important to the issue, but I don't have any intel cards here to check)​

 

[Uranium Donut]

Bump :)