Bank of America keeps signing me out after I successfully log in and then click on account

Bank of America customer service thinks it's my computer/browser because I can get in to my account through the app and successfully click on accounts. And because I can also log in and click on accounts no problem on my phone through Edge. This happens only when I log in on my computer in Edge--and in Chrome. Once in a while it will actually NOT log me out immediately. I've tried clearing the cache, making sure cookies are being saved, etc. No substantive help in my many, many searches on the matter. Help!