NEW YORK -- Bank of America still isn't explaining why online banking may be slow for some of its customers for a sixth day in a row.
A message on the bank's home page Wednesday said most of the site was working normally, but that customers may experience "occasional delays."
A spokeswoman for Bank of America Corp., Tara Burke, says the company doesn't disclose the causes for website problems and noted that online banking was now available.
She declined to say how many customers may still be experiencing slowness signing in.
"Given the last few days, we are rigorously monitoring our online banking system and chose to continue deploying an alternate home page to ensure that customers get to the right destination quickly," Burke said.
The website delays mean customers who normally bank online may have had to head to a branch or ATM to access their accounts in recent days.
Bank of America., based in Charlotte, N.C., is the largest U.S. bank by deposits and has 29 million online customers.
Bank of America customers also had difficulty accessing their accounts in January and March. In both those instances, the bank said the problems resulted from routine system upgrades.
The latest problem is notable because of its duration.
"We're in an environment now where electronic banking is a mainstream channel," said Jacob Jegher, an online banking analyst with Celent. "Any extended outage is unacceptable -- particularly for a bank with this many customers."
If an outage does occur, Jegher said banks need to be proactive in keeping customers updated on when they can expect the problems to be resolved. Even if the bank doesn't give an explicit reason for an outage, he said that social media have led customers to expect a greater level of communication from companies.
That's especially true for financial institutions because they handle such delicate information, he said.
Bank of America has said multiple times since Friday that the website had been fully restored. As the troubles continued this week, however, the bank changed its message and declined to say when it expects the site to be fully up and running again.
The problems began a day after the company said it would start charging a $5 monthly debit card fee. That announcement Thursday was met with customer outrage; an online petition at Change.org asking the bank to reconsider the decision had more than 132,500 signatures by Wednesday afternoon.
Several major banks have introduced new or higher fees for checking account customers in the past year. The industry says the changes are needed because of a new regulation that limits the fees they can collect from merchants whenever customers swipe their debit cards.