3com 3018 - line goes down every x seconds

[horaces]

Dear

We have a leased line between headquarters and remote location. Both end points have a 3com 3018. Since few weeks we have communication problems. I can see on the router that the line and interface are going down every x seconds, and come up again after a second:

Interface Ethernet0 is DOWN
Line protocol ip on the interface Ethernet0 is DOWN
Interface Ethernet0 is UP
Line protocol ip on the interface Ethernet0 is UP

see log:

http://users.telenet.be/kempen/3Com3018/

This is causing ontinuous disconnects in the applications they use at our remote location who are working on our central database at our headquarters.

Any idea what my cause these disconnects?

Regards

H