UTM to XG, WAN interface error state

Question

i've migrated My network from Sophos UTM to Sophos XG, but somehow my WAN interface is counting many of error packets (RX), and my network is getting slower, meanwhile if i use Sophos UTM, there's not any error counted. is there anyone ever facing this issue ? 
 In Sophos XG Firewall 
 I n Sophos UTM

sachingurung · Answer

Hi, 
 Error packets are observed due to the mismatch with speed negotiation. The auto-negotiated Interface Speed should be a Full Duplex connection. If any interface has negotiated with a Half Duplex, manually set the Interface Speed to match that of the peer device. To set the interface speed, navigate through System > Network > Interfaces > edit the interface with error > Advance Settings> Interface speed. 
 After changing the interface speed, take SSH to XG and go to option 4. console: show network interfaces, run the command multiple time and observe which interface speed halts the increase in error packets. 
 Thanks

sachingurung · Answer

Hi, 
 Deploy an intermediate (unmanageable) switch? 
 Hope that helps.