Avaya 5621SW IP always rebooted

[Sharifvoice]

Hi, We are using one Avaya 5621SW IP as an operator console since last four years with IP 500 box. Recently the phone not working and reboot frequently. I share a log of error capture from system monitor. Please provide a solution.

Thanks in avdance.

"********** SysMonitor v10.1 (73) [connected to 192.168.2.90 (00E007039CBF)] **********
2159112446mS H323Evt: Recv: RegistrationRequest 192.168.2.94; Endpoints registered: 5; Endpoints in registration: 1
2159113494mS H323Evt: Recv GRQ from c0a80222
2159113494mS H323Evt: e_H225_AliasAddress_dialedDigits alias
2159113494mS H323Evt: found number <100>
2159113533mS H323Evt: Recv: RegistrationRequest 192.168.2.34; Endpoints registered: 5; Endpoints in registration: 1
2159113533mS H323Evt: e_H225_AliasAddress_dialedDigits alias
2159113534mS H323Evt: found number <100>
2159113534mS H323Evt: RRQ --- CallSigProtocol is H323AnnexL_P. Go for Avaya 4600IP phone
2159113534mS H323Evt: RRQ --- Treat this as a forced login, the phone was probably rebooted (same_cs_addr 0)
2159113535mS H323Evt: GK: Unregister endpoint 00E007039CBF_52e52d773c373f25 for extension 100
2159113536mS H323Evt: GK: Send URQ
2159113537mS H323Evt: RRQ --- Register extn 100 using product IP_Phone, version 2.9010
2159117445mS H323Evt: Recv: RegistrationRequest 192.168.2.91; Endpoints registered: 5; Endpoints in registration: 1
2159126715mS H323Evt: Recv: RegistrationRequest 192.168.2.92; Endpoints registered: 5; Endpoints in registration: 1
2159128761mS H323Evt: IRCheckTimer: GRQ record deleted (user name=; extn-num=100)"