Macbook pro 2017 15inch asks for goes to sleep and asks to plug in charger while doing heavy tasks such as video export.

Hello everyone , I have recently bought a macbook pro 2017, 15 inch. It goes smooth with everything such as browsing internet or using multimedia on battery. But when it is put to a heavy task such a exporting a 1080p video through finalcut pro, it suddenly goes to sleep as export reaches 15 to 20% and shows the sign to plug in charger. As i plug in charger, it comes back where it was and exporting is going on as well and 40 to 50% of the battery was available too.Moreover, battery health is normal and is around 250 cycles.

I want to confirm if there is anything to worry about. Thanks for having me.