Can't log in keep saying your session has expired.

After trying to place an order since 7/3, I just gave up.  I had a trip to make to the city and went shopping for the things on my list.  Walmart's system previously wouldn't allow me to update my password - finally the tech folks had to reset it w/a temp.  I don't know what's going on with them but as a shareholder and a consumer - I'm seriously worried.  Their inventory is also having issues....big issues.