Some sets become out of service randomly

[Sam2009]

Hi
I have OXE Common HW, R8.0.1 G1.503.27.
I face this problem : Some sets in service and others are becomming out of service randomly on all boards
we see this alarm
28/11/10 09:51:53 000001M|002/02/-/---|=4:3754=UA link no longer responding
28/11/10 09:51:53 000001M|002/02/0/008|=3:2050=UA Terminal 8 Loss
28/11/10 09:52:00 000001M|002/02/0/008|=5:2053=Terminal 8 in service
28/11/10 09:52:09 000001M|002/02/0/006|=5:2053=Terminal 6 in service
28/11/10 09:52:10 000001M|002/02/-/---|=4:3754=UA link no longer responding
28/11/10 09:52:10 000001M|002/02/0/008|=3:2050=UA Terminal 8 Loss
28/11/10 09:52:19 000001M|002/02/-/---|=4:3754=UA link no longer responding
28/11/10 09:52:19 000001M|002/02/0/006|=3:2050=UA Terminal 6 Loss
28/11/10 09:52:26 000001M|002/02/0/006|=5:2053=Terminal 6 in service
28/11/10 09:52:31 000001M|002/02/0/005|=5:2053=Terminal 5 in service
28/11/10 09:52:36 000001M|002/02/-/---|=4:3754=UA link no longer responding
28/11/10 09:52:36 000001M|002/02/0/006|=3:2050=UA Terminal 6 Loss
28/11/10 09:53:04 000001M|002/02/0/005|=5:2053=Terminal 5 in service
28/11/10 09:54:49 000001M|002/01/0/013|=5:2053=Terminal 13 in service
28/11/10 09:54:59 000001M|002/01/-/---|=4:3754=UA link no longer responding
28/11/10 09:54:59 000001M|002/01/0/013|=3:2050=UA Terminal 13 Loss
28/11/10 09:55:38 000001M|002/01/0/013|=5:2053=Terminal 13 in service
28/11/10 09:55:48 000001M|002/01/-/---|=4:3754=UA link no longer responding
28/11/10 09:55:48 000001M|002/01/0/013|=3:2050=UA Terminal 13 Loss
28/11/10 10:03:09 000001M|004/08/0/000|=5:2053=Terminal 0 in service


Please help me quickly
thanks

[Eliott]

Cabling issue...?