Huel Black Edition tasting very stale... any way to combat stale taste?

I have been drinking Salted Caramel, blended with ice for several years. Used to love the taste but as of late, it tastes very stale. At least the last couple of shipments.

Tried Chocolate and the stale flavor was even more pronounced – this was so undrinkable I asked for a refund.

Is it just me? Anyone else? Anyone found a way to combat this?..