Something keeps wiping out all my online banking sign-on information. I suspect it is Norton 360!

Something keeps wiping out all my online banking sign-on information.  I suspect it is Norton 360!  Lately every time I go to sign on to my online banking it has been reset so that I have to once again enter everything as if I was a new user.  I can reset the information, tell it to "save on this computer", and come right back on and it will still be right.  Then after a time I come on again and once again it has been reset to "guest".  This was not always like this and I suspect Norton 360 is doing this when it does it's idle time background tasks.  I have tried to change or disable everything I can find in Norton 360 but still this keeps happening.  It is driving me nuts.  Does anyone have any idea what is doing this or what I can do to stop Norton 360 from reseting my vital Internet sign-on information?  Thanks... DWK