Perforce issue

Hi! I am using DO to host perforce server and all were fine half a year. but few days ago perforce’s behavior is so strange . Its hanging and cant reach the server = so the editor hanging as well =((. (if visual client already running its blinking like its has no internet connection)
login via cmd is successful but visual client isn’t appear as window and only exist as process . Server ping is successful.
if I am enabling VPN - all becomes fine.
wtf ? thanks!