Dragon Tree shedding loads of leaves really randomly, what do I do?

Hi all,

I trust you guys so much. Over the last few days my dragon tree has started shedding leaves quite a lot which hasn’t happened in the 2-3 months that he’s been in my care. The leaves that are shedding turn yellow and then detach from the main stem. You can see evidence of the fallen leaves as I’ve just been collecting them.

I usually water once ever 2-3 weeks. I was away on holiday and I have a feeling my aunty must’ve watered him weekly. I’m otherwise concerned that there may be a bug or root rot but there’s no signs of either of those issues. But, should I be concerned/what can I do to ensure this doesn’t continue?

Thank you in advance!