NEW YORK ( TheStreet) -- Bank of America ( BAC) is blaming the slowness of its homepage in recent days on an ongoing technology- upgrade, according to a report by the Wall Street Journal. The bank's head of online and mobile banking, David Owen, told The Wall Street Journal late Wednesday that a "convergence" of factors had caused the troubles in the site, with heavy customer traffic overburdening the site amid its web upgrade. The bank has had difficulties with its website intermittently for the last six days. While temporary tech hiccups are not unusual, the failure of the online banking platform came on the heels of Bank of America's announcement of a $5 monthly fee for debit-card purchases that infuriated customers, adding to their irritation. Customers who use online banking to pay bills could be facing late fees as a result of the disruption of service. Worse, Bank of America did not disclose the reasons for the site's slowness until late Wednesday, which sparked speculation that its site might have been the target of hackers. The bank, however, insisted that the site was not under any kind of attack from malware. "Our Online Banking systems are available to customers. 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," spokeswoman Tara Burke told TheStreet earlier on Wednesday. The bank told the Journal late Wednesday that it would work with any customers who accumulated fees on an individual basis amid the website problems. --Written by Shanthi Bharatwaj in New York >To contact the writer of this article, click here: Shanthi Bharatwaj. >To follow the writer on Twitter, go to http://twitter.com/shavenk. >To submit a news tip, send an email to: firstname.lastname@example.org.