Shelf down

[Xero]

Dear All,

One of the RPSs of my customer using release 8.0.1 was down and I saw the below incidents can anyone help me why do these incidents occur??

18/05/11 14:18:05 000001M|005/20/0/254|=2:0379=Inter ACT link HS: 22,(19,1),10.36.11.8,00:80:9f:73:fa:fb
18/05/11 14:18:05 000001M|005/--/-/---|=2:2043=Loss of the 5 CRYSTAL
18/05/11 14:18:05 000001M|005/00/-/---|=2:2042=Loss of a UA type cpl
18/05/11 14:18:05 000001M|005/01/-/---|=2:2042=Loss of a Z type cpl
18/05/11 14:18:05 000001M|005/26/0/000|=4:2011=No more TS between CR 5 and CR 4 or no more conference resources
18/05/11 14:18:05 000001M|005/26/-/---|=4:2615=Voice Guide channel lack for VG No 2
18/05/11 14:18:05 000001M|005/26/0/000|=4:2011=No more TS between CR 5 and CR 4 or no more conference resources
18/05/11 14:18:05 000001M|005/26/-/---|=4:2615=Voice Guide channel lack for VG No 1021
18/05/11 14:19:02 000001M|005/20/-/---|=4:0740=Beginning of an INT/IP downloading @:00.80.9f.73.fa.fb (binintip_app
18/05/11 14:19:02 000001M|005/20/-/---|=5:0741=End of downloading of an INT/IP board @:00.80.9f.73.fa.fb (binintip_app
18/05/11 14:19:43 000001M|005/20/-/---|=5:0409=The inter-ACT link over IP from (19 1) is up
18/05/11 14:19:44 000001M|005/20/-/---|=0:5857=GD/GA/INTIP/RGD: reason of reboot 5
18/05/11 14:19:44 000001M|005/03/-/---|=4:0260=Beginning of downloading bnvdsp0z32
18/05/11 14:19:44 000001M|005/05/-/---|=4:0260=Beginning of downloading bnvdsp0z32
18/05/11 14:19:44 000001M|005/25/-/---|=4:0260=Beginning of downloading bnvdsp0z32
18/05/11 14:19:44 000001M|005/27/-/---|=4:0260=Beginning of downloading bnvdsp0z32
18/05/11 14:19:44 000001M|005/18/-/---|=4:0260=Beginning of downloading bnvdsp0z32
18/05/11 14:19:45 000001M|005/11/-/---|=4:3501=Clock loss