Synology 突然斷線

尋晚用用下隻synology 415, 突然斷線,用第二部電腦ping 極都ping唔到,試過哂ddns同192.168.X.x都唔得,甚至用synology assistance 都掃唔到
但係用佢個command line 就見到部機network setting 好正常
我已經reboot過部機同router, 換過哂d lan線,但都係唔得,有無師兄有idea?