By Don Clark 

SanDisk Corp. delivered another grim forecast of its business prospects, pointing to issues that seem more specific to the company than the broader electronics industry.

The company, a major maker of flash-memory chips and products that use them, on Thursday cut its outlook for the current quarter and for the year. SanDisk's projection caused its shares to plummet as much as 19% to a new 52-week low.

The plunge in SanDisk shares followed another drop in January when the Milpitas, Calif., company projected disappointing fourth-quarter results--later reporting a 40% drop in profit--and pointed to weak results for the first half of the year.

"They've had a series of disappointments," said Ambrish Srivastava, an analyst at BMO Capital Markets.

Thursday's SanDisk forecast also came on the heels of a recent revenue warning from Intel Corp., the biggest maker of processor chips used in computers. Negative factors affecting many companies include the rising value of the dollar versus foreign currencies, which in some cases has hurt sales by making the price of U.S. goods more expensive to customers abroad.

But analysts who track SanDisk mainly point to its own miscues. Shares of Micron Technology Inc., another big maker of flash memory chips, rose 1.1% Thursday.

Flash memory has long been used in consumer products like smartphones and tablets, and increasingly in hardware that stores data from server systems. SanDisk originally was known mainly for storage cards and thumb drives that use such chips, but it also sells them separately as part of a manufacturing joint venture with Toshiba Corp.

Demand for such chips has been growing steadily, but companies frequently get in trouble when they make too much of particular products, leading to sharp price declines, or can't make enough of them.

In January, SanDisk pointed to production snafus, disclosing that its inventories had fallen because of factors that included maintenance issues with production lines in Japan and a lower-than-expected yield of defect-free chips.

The company also said in January that it had lost a major customer for its solid-state drives, or SSDs, flash-based devices that store data in computers. SanDisk didn't name the company, but Mr. Srivastava and other analysts believe Apple Inc. switched to SSDs from Samsung Electronics Co. for some computers. Neither Apple nor Samsung have commented on the matter.

On Thursday, SanDisk pointed to additional problems, including delays in customer testing and approval of certain products for purchase. It also cited lower pricing of some products and lower-than-expected sales of products to enterprises, an area SanDisk had identified as a major growth opportunity, leading to high hopes among some investors.

"That's the crown jewel of SanDisk," said Nomura analyst Romit Shah.

Combining the latest factors with its prior struggle to build inventories, SanDisk said it expects to post revenue of $1.3 billion for the quarter ending March 29, compared with the $1.4 billion to $1.45 billion it had forecast in January.

"We are disappointed with our financial outlook," said Sanjay Mehrotra, SanDisk's chief executive, in prepared remarks. "We will work through these headwinds, leveraging our compelling product road map and broadening customer base."

The company on Thursday said its full-year revenue would be lower than its previous guidance, but it didn't specify by how much. The company also said it is postponing an investor meeting that had been scheduled for May to an unspecified future date.

In January, the company projected revenue of $6.5 billion to $6.8 billion for the year, compared with analysts's expectations at the time of $7.23 billion.

Chelsey Dulaney and Maureen Farrell contributed to this article.

Write to Don Clark at don.clark@wsj.com

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