Nearly nine in 10 consumers who conduct online transactions have experienced problems, according to a Tealeaf-commissioned study conducted by Harris Interactive.

More than 40% of those who had problems switched to a competitor or abandoned their transactions. Another 52% stopped doing business with the company. "We're in a perfect storm as users' dependency on e-commerce grows and their patience for bad online experiences wears thin," said Rebecca Ward, CEO of Tealeaf, in a statement.

Online consumers' problems did not end at the store. More than one-half of online users with issues contacted customer service, but 49% of them still did not have their problem solved. Nearly seven in 10 thought service agents did not know enough about the Web site, and 70% did not believe the agent understood their problems.