All the traditional Android OEMs are or will be hurting
They can't compete with the pricing or inbuilt language/nationalistic advantages of Chinese and Indian firms that are gaining share rapidly in those hot markets.
I doubt it is problems selling their flagships, but that market is saturated so they're pretty only stealing share from each other. With reduced volume from the lower/mid range products they have fewer units to spread their costs around and profitability inevitably suffers. Not that any of them were making much of anything selling Android phones, aside from Samsung.