2019 Lexus RC UNKNOWN OR OTHER

Driving down the highway on the way to work this morning and my sunroof completely shattered. There was no surrounding traffic or road obstructions to create projectiles from rocks etc. No noises of impact and no sign of foreign objects amongst broken glass. Completely shattered on it's own. Sunroof operated normally days prior to incident without issue. No suspect noises or delays in operation. The glass lifted partially after breaking, littering the highway. Car has not been inspected at this time. Reached out to car manufacturer who is "aware this is a reoccurring problem" but it is not an open recall. I see there was a previous class action lawsuit in 2016 for this issue but no active recalls? How is it legally proven the company is at fault, the company is aware this is a reoccurring issue, but will not take ownership and cover costs via recall? Awaiting call from manufacturer to determine who is liable for payment but I feel this should not fall on the consumer.