Purchased a set in January 2021 and by August 2021 they had started to crack at the base. Most are hairline fractures starting at the edge and spreading inwards toward the center. One glass is so bad it has started to leak.  The set is used daily, hand washed and top-rack dishwasher (they are rated “dishwasher safe”.). We had a previous set from a different manufacturer that also exhibited the same problem over time, but not within eight months of normal use.  Very disappointing. Not sure if there is a warranty.