Also seeing this on 8540 HA-SSO with 8.3.133.0, however, in addition to 'Reason 5' I am also seeing 'Reason 19' as pasted below.
UsmDb:HA_send_usmDbSpamSetRadSlotBand, ErrType:Apply Config failed on Standby, Reason:19, TStamp:2017-Nov-06 12:26:19
UsmDb:HA_send_usmDbSpamSetRadSlotBand, ErrType:Apply Config failed on Standby, Reason:19, TStamp:2017-Nov-06 12:26:13