PTP450i- SMS ES RESET, EACH DAY REGULAR INTERVAL OF 24H

HI, WE have link PTP450i installed since 6 months, link is very good, but customer tell me that the link is down for 30 sec and going up. precisly at 9h30 AM.  

release is : CANOPY 14.2.1 BHUL450-DES

can you help me, thanks

/31/2017 : 09:28:28 EST : Event: SMSESRESET, MsgType: AUTHREKEY, NewState: OOSERVICE, Flag 0
01/31/2017 : 09:29:59 EST : Event: SMSESACTIVATE, NewState: REGISTERING, Flag 0
01/31/2017 : 09:29:59 EST : Event: SMSESFAIL, MsgType: SMREGGNTREJ, NewState: OOSERVICE, Flag 3
01/31/2017 : 09:30:06 EST : Event: SMSESACTIVATE, NewState: REGISTERING, Flag 0
01/31/2017 : 09:30:06 EST : Event: SMAUTHENMSG, NewState: REGISTERING, Flag 0
01/31/2017 : 09:30:07 EST : Event: SMSESINS, NewState: REGISTERED, Flag 20
01/31/2017 : 09:30:07 EST : Event: SMAUTHORMSG, NewState: REGISTERED, Flag 0
repeated 2 times
02/01/2017 : 09:28:27 EST : Event: SMSESRESET, MsgType: AUTHREKEY, NewState: OOSERVICE, Flag 0
02/01/2017 : 09:30:08 EST : Event: SMSESACTIVATE, NewState: REGISTERING, Flag 0
02/01/2017 : 09:30:08 EST : Event: SMSESFAIL, MsgType: SMREGGNTREJ, NewState: OOSERVICE, Flag 3
02/01/2017 : 09:30:16 EST : Event: SMSESACTIVATE, NewState: REGISTERING, Flag 0
02/01/2017 : 09:30:16 EST : Event: SMAUTHENMSG, NewState: REGISTERING, Flag 0
02/01/2017 : 09:30:16 EST : Event: SMSESINS, NewState: REGISTERED, Flag 20
02/01/2017 : 09:30:16 EST : Event: SMAUTHORMSG, NewState: REGISTERED, Flag 0

Hey, on the AP, under configuration, Security Tab... is  "24 hour encryption refresh" enabled? If it's enabled... disable it and see if your problem goes away.