Certified GKH Gardening Expert
This indicates and issue with the roots. I would suspect that the bamboo may be pot bound and is not able to get enough water. It also may be root rot or underwatering. Check the roots and adjust as needed - repot if root bound, treat for root rot if you suspect that (https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm) or increase watering if you think it may be underwatered.