Some older Teslas are spontaneously bricking because their embedded flash memory is wearing out, according to three independent Tesla repair professionals who have studied the issue.

The issue is with a flash storage chip called the eMMC that is embedded on a board called the MCU1. According to experts who have studied the problem, Teslas are writing vehicle logs to this flash storage chip so much that it eventually goes bad. The issue has been known in the Tesla community since at least May, when Tesla repair YouTuber Rich Benoit spoke to another Tesla repair professional named Phil Sadow about it in a video.

“Tesla’s got a problem. They create so many logs in the car, they write to [the chip] so fast that it basically burns them out. They have a finite amount of writes,” Sadow said in the video. “When this burns out, you wake up to a black screen [in the car’s center console.] There’s nothing there. No climate control. You can generally drive the car, but it won’t charge.”

Sadow suggested that this begins to happen after about four years of driving, though it can vary. Many Tesla owners still haven’t seen the issue, while others have posted on message boards about it happening on a quicker timeline. Tom’s Hardware previously reported on the issue.

The issue highlights the fact that Tesla is not bound by the same rules when it comes to repair as other auto manufacturers. Tesla is not party to a memorandum of understanding signed by other auto manufacturers in 2014, in which they agreed to sell parts to independent repair shops.

As a result, there are very few independent Tesla repair professionals, acquiring parts to repair Teslas is very difficult, and finding or making aftermarket parts is also difficult. Many parts used by independent repair professionals are salvaged from wrecked Teslas.