Schwab says high volumes and technical issue with key vendor triggered Monday’s outage

(Adds details on outages and comments from Interactive Brokers and lawyer in paragraphs 4-10)

By Suzanne McGee

Aug 6 (Reuters) - Charles Schwab & Co. said on Tuesday that high trading volumes and a technical issue with a key vendor triggered temporary outages on its trading platform on Monday, a day when its customers rushed to navigate an outsize market selloff.

A spokesperson for the firm did not identify what kind of technical issue hampered the ability of Schwab clients to log on to their accounts, or name the vendor.

"A combination of higher volumes and a technical issue with a key vendor affecting our systems led to log-on issues and call wait times that were longer than we expect," the spokesperson said in an emailed statement, adding the issues were resolved and "platforms are fully available."

Other firms also had issues.

Some U.S. customers reported struggling to log in to their accounts at Fidelity and Vanguard on Monday morning, the firms said in social media posts that day, even as Wall Street's main indexes opened sharply lower thanks to weak economic data, underwhelming technology firm earnings reports and increased anxiety about the geopolitical outlook.

Outage tracking website Downdetector.com reported that nearly 14,500 Schwab users could not access the site, while more than 3,600 users reported problems with Fidelity.

Fidelity confirmed that some of its customers experienced intermittent outages on Monday morning but declined additional comment. A spokesperson for Vanguard declined comment on the cause of access issues on Monday at that firm.

Steve Sanders, executive vice president at Interactive Brokers, said that in the first 90 minutes of trading on Monday, the firm traded more than 5 million shares, compared to 5.9 million throughout the full trading session Friday. Interactive Brokers said it did not experience any outages on Monday or overnight.

Some disappointed investors reached out to Lawrence Klayman, an attorney whose Boca Raton, Florida-based securities law firm KlaymanToskes specializes in pursuing trading-related arbitration claims.

"The wheels of justice grind slowly," Klayman said, noting that it will take time and research to assemble and file any claims, and that only those investors who lost $100,000 or more may find arbitration a cost-effective remedy.

(Reporting by Suzanne McGee; editing by Megan Davies and Will Dunham)