This has been going on for well over a year.  I honestly don't know why I've put up with it as it only happens with Shaw Webmail  - no other site.  It also only happens on my Acer laptop, not on my Google Pixel phone or my desktop computer, so I've been told the problem is with my computer.  

I have performed all of the suggested "fixes". 

• I can't count the number of times I've cleared the cache, and often have to clear everything including cookies,  which means re-entering passwords on  websites.  
• I could login most of the time on Incognito.  Half the time I have to  keep clicking on "Sign In" until it does.  This is a total pain, having to switch back and forth.  I could open everything in Incognito but that involves entering passwords . . . . very annoying.
• I can tell you the complete procedure for getting a quick reply from "Chat", including bypassing all the AI stuff at the beginning by entering "Agent" right away.  I've been on "chat" at least once a month - it usually turns out that my account is "locked".  I have no idea why and they never explain why.  They unlock it and everything works.  
• I've changed my password many, many times but that never helps so I've stopped doing it.  

Today, I can't login on, even Incognito.  Went to Chat and my account was unlocked.  Changed my password.  yada yada yada.   I still can't log on.  Nothing works so I've just accepted that i can't access my Shaw Webmail on my laptop.  Sad situation and totally unacceptable but SHAW doesn't seem to care.    I thought when Rogers took over things might change since their ads said they were spending $2 billion on upgrades.  Time to switch.