Sanity Point Failure Detected PTP 650

Hi 

I recently upgrade the master and slave PTP 650 with the firmware 1-47 and since then the PTP slave do random reboot with the syslog messsage:

event; sys_reboot; System Reboot, reason=Sanity Point Failure Detected;

event; cold_start; PTP wireless bridge has reinitialized, reason=Sanity Point Failure Detected;

There no power issue on the site, and we check the PDU and is working. 

Thanks in advance on any info ypu can provide to solve this problem