PTP 550 hang

Hi , i install a ptp link with ptp550 3 weeks ago. Everything looking fine until last week in the night we got like -25 and the antenna hang. He disconnect from wireless. The http port is still open but not load the complete web page. I was able to ssh in it but when i do a reboot command he doesn't do it. After a couple of time of trying i got this message...

Try to get lock. Please wait...
Can't get lock.

I have to go on site and disconnect the power on the antenna to get it working again. I using 4.4.3. Anyone got this behavior?