DF Player Mini Overheating

Hi! I only have basic arduino experience and I am building a digital music box as a gift.

It's a super simple circuit using a [**DF Player Mini**](https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299), running in parallel with a few LEDs using a **3 AA battery pack.**


Basically the circuit in [this video](https://youtu.be/2wHRHFxTB6c) with extra LEDs and a battery pack.

I'm including a switch to disconnect the power source. The DF player mini is also connected to two buttons to control volume/songs.

* The DF player mini runs on 3.2 - 5.0V.

* I've measured the battery pack to output 4.6V.


* The current of the DF player mini was 250mA in use when working properly.

* The current of the LEDs is 60mA.

However, it heats up as if there is something wrong (too hot to touch comfortably)

I reconnected everything in a breadboard, and it stopped heating up (I assumed a connection issue), so I continued with soldering everything together.

Now that I finally finished, the problem came back even worse as it heats up even during playing (it used to only start heating up after it paused).

I'm at my wits ends and am about to scrap my project because I can't figure out what's wrong.

Here's a video of it in action (I fixed the light connection problems, didn't solder a resistor well enough): https://streamable.com/dkrm8

Here's a picture of each side of the DF player mini:

Side 1: https://i.imgur.com/UbuGFYT.jpg

Side 2: https://i.imgur.com/p0uPaLM.jpg

The header pins were soldered on when I bought it and looked good.

The only thing I can think of is that I did something wrong with the ground? There are two grounds and I only used the side with the IO pins.

Thank you!