No Internet Connection Detected, not works connection for LAN

today i did have problem with my ISP for almost 5 hours. for those 5 hours not could connect for SMB direct for LOCAL IP. \192.168.1.8
i did try for NFS and SMB.
in fact I had to reset the system thinking that it could have been unconfigured by accident. but nothing . only all works fine when my internet returned.

What could be happening?

regards.

always i have ping and web access.

EX4100
firmware : 2.31.149

My Cloud is a online personal Cloud storage device and would be use in the present of internet access. However it allows to access dashboard of My Cloud system on local network.