Continuously receive disarm by remote message

Since Saturday, one of the wired camera suddenly turn on and off more than 15 times per day. 
and i continuously receive Disarmed by remote message over 20 times each day. 
I have already updated to latest frameware, but the problem still exists.

today even worse, both motion sensors are unable to detect. 
is this my system problem? I only used this 368 days, according to the software record.