2022 Panasonic Aero Series split air conditioner

This air conditioner is in my bedroom, I usually set it 23-27*C. This ac is very cold and it's cools the room fast. The indoor unit is very quiet while sometimes the outdoor is very noisy at night, it would makes my neighbor very angry.
Specifications:
-Model: CS/CU-XU12XKH.
-Refrigerant: R32
-Production date: December 2021
- This one is made in Malaysia.

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After a few minutes, it's quieter now. I don't know why it's very loud last time. Anyone have any ideas about this?

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Lol rich