Unstable ethernet speed on jetson TX2

Hi,

I capture image from MIPI camera, I process and send them by socket to a PC.

Until today, everything were going well.

I need an ethernet speed of 1000 Mb/s. Without any reason, the ethernet speed of the jetson is down to 100Mb/s during the running during the process (maybe after after having sent 2/3 Go by socket).

I change the ethernet speed to 1000Mb/s, reboot the jetson, and the problem appears again.

Does someones already has the same problem ?
Notice that I do not use a PCI, it is the ethernet port of the developper kit, and it had been working well during 3 weeks.

Maybe it can help to figure out the problem :

Settings for eth0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
	                                     100baseT/Half 100baseT/Full 
	Link partner advertised pause frame use: Symmetric Receive-only
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 100Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
	Link detected: yes

Thank you for your help