Dark spots on Strelitzia?

My indoor Strelitzia Nicolai has recently developed some light brown spots on its leaves and I am nervous it will keep on spreading. I spray it with water every now and then and otherwise make sure the soil is not too dry or too moist.

Does anyone know what the cause of this can be? Thanks in advance for any advice.
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    Paris Lalicata Hi Guri! The symptoms look like either over watering or a fungal infection that developed. I would ensure the plant is exposed to plenty of bright indirect light as BOP don't thrive well in low light situations. It'll be good to allow the soil to dry out completely to the bottom of the planter. If it's due to over watering then once balanced with the right care you should notice these symptoms ceasing! However, if the spots continue to spread despite proper care then there's a chance a fungal infection developed