Norton Security signs off by itself, web account switches to Chinese

Hi, I use Norton Security on my Mac Mini with Mac OS X 10.10.3. Yosemite, 2,6 GHz Intel Core i7, 16 GB 1600 MHz DDR3, Intel HD Graphics 4000 1024 MB. When I open my Norton Security account on the web, the language switches to Chinese and it is very difficult for me changing it back to EN and sign in. Also, the Norton Security app signs me off by itself, causing security issues, trouble with updates of the antivirus database, etc. Anybody having the same experience on the Mac OS X platform? I have the same problem on my MacBook Air ... Any suggestions? Why doesn't the NS account on the web use the language specified in the personal settings (EN)?  Thanks, Zed