Certified GKH Gardening Expert
Could you include a photo? This sounds like it is too moist, with not enough drying out of the soil. Bathrooms can get quite humid if there is not plenty of ventilation.
I would make sure to only water when it is almost dry. If you water it before it has time to dry out a little, it will come down with an infection, which can be harder to cure than prevent.
This article will help you with their care: https://www.gardeningknowhow.com/houseplants/dumb-cane/growing-dumbcane-dieffenbachia.htm
Thank you for the advise, plant seems to be coming right, as I have been placing tissue paper under pot to absorb excess water, did this for 4 days, plant not so droopy.