UPDATE 3-Computer mouse maker Logitech hit by supply chain problems

* Computer mouse maker reports highest-ever Q2 sales

* Operating profit shrank due to higher promotions spend

* Expects supply chain, logistics problems to continue (Adds CEO comments)

By John Revill

Oct 26 (Reuters) - Logitech International SA shares plunged 6% on Tuesday after the computer peripherals maker reported a steep fall in operating profit and said it was facing "unprecedented" supply chain problems.

The maker of keyboards, mice and headsets became the latest company to warn about the difficulties getting enough semiconductor chips due to clogged up transport links and stuttering factory restarts by suppliers.

Swiss engineering firm ABB and Sweden's Ericsson last week flagged problems getting enough parts to make their products.

"This supply chain challenge will continue throughout the rest of this year," Logitech Chief Executive Bracken Darrell told Reuters, referring to the company's financial year which runs to the end of March 2022.

"We will have some issues delivering at the levels of demand that are out there," he added. "On the logistics side, we just have to do the best we can, and plan well."

The time to air-freight components has increased to two weeks from four or five days previously, while costs have spiralled, Darrell said.

Logitech was reacting by adding more suppliers as well as building up its inventory of components to satisfy still strong demand driven by stay at home workers and gamers, the executive said.

During its quarter to the end of September, Logitech sales rose 4% to $1.31 billion, beating a forecast of $1.25 billion in a Refinitiv poll of analysts.

The figure was 82% above the comparable pre pandemic figure for the second quarter of 2019.

Darrell said he did not think the work from home trend had been exhausted, with many customers now upgrading their home office computer equipment.

The Swiss-U.S. company, the first to manufacture and sell computer mice in the 1980s, is also spending more on promotions and marketing in stores compared with last year, when many retailers were closed.

As a result non-GAAP operating income declined 40% to $211 million during the quarter. Net profit fell 48% to $139.5 million. Shares were down 6.5% at 13.17 GMT.

Logitech maintained its outlook for the financial year through March 2022, still expecting full-year non-GAAP operating income of $800 million to $850 million and flat sales growth plus or minus 5%.

Zuercher Kantonalbank analyst Andreas Mueller said he thought the share price reaction seemed exaggerated.

"They are well prepared with plenty of inventory into the Christmas season. And they can afford it given the healthy balance sheet," he said. (Reporting by John Revill in Zurich and Akriti Sharma in Bengaluru; Editing by Sherry Jacob-Phillips, David Evans and Christina Fincher)