member switch hanging

switches hang themselves and stop responding, when we go to the site we find that switch light in red color when we restart the switches every thing comes back normal.

<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[dot1s_task]: traputil.c(777) 12457 %% Po1 is transitioned from the Forwarding state to the Blocking state in VLAN 337
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[dot1s_task]: traputil.c(777) 12456 %% Po1 is transitioned from the Forwarding state to the Blocking state in VLAN 333
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[dot1s_task]: traputil.c(777) 12455 %% Po1 is transitioned from the Forwarding state to the Blocking state in VLAN 332
<189> May 25 05:43:18 PRIBB05PBSW-2 DOT3AD[dot3ad_core_lac]: dot3ad_lac.c(251) 12454 %% ch1 is down.
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12453 %% Link on Te2/1/1 is failed
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12452 %% Link Down: Te2/1/1
<190> May 25 05:43:18 PRIBB05PBSW-2 DOT3AD[dot3ad_core_lac]: dot3ad_db.c(962) 12451 %% Interface Te2/1/1 detached from ch1.
<190> May 25 05:43:18 PRIBB05PBSW-2 DOT3AD[dot3ad_core_lac]: dot3ad_db.c(962) 12450 %% Interface Te1/1/2 detached from ch1.
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12449 %% Link on Te1/1/2 is failed
<189> May 25 05:43:18 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12448 %% Link Down: Te1/1/2
<190> May 25 05:43:10 PRIBB05PBSW-2 DOT3AD[dot3ad_core_lac]: dot3ad_db.c(962) 12447 %% Interface Te1/1/1 detached from ch1.
<190> May 25 05:43:10 PRIBB05PBSW-2 DOT3AD[dot3ad_core_lac]: dot3ad_db.c(962) 12446 %% Interface Te2/1/2 detached from ch1.
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12445 %% Link on Te1/1/1 is failed
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12444 %% Link Down: Te1/1/1
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12443 %% Link on Te2/1/2 is failed
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12442 %% Link Down: Te2/1/2
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12441 %% Instance 0 has elected a new STP root: 5181:f8b1:563e:d8da
<189> May 25 05:43:10 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12440 %% Unit 2 elected as the new STP root
<189> May 25 05:43:09 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12439 %% Instance 0 has elected a new STP root: 4c81:f8b1:563e:d8da
<189> May 25 05:43:09 PRIBB05PBSW-2 TRAPMGR[trapTask]: traputil.c(735) 12438 %% Unit 2 elected as the new STP root