How to fix overheating

[Erebos]

Hi, i started a DIY (I found the scheme on the internet), but i replace the 9V battery with lipo 18650, 7.4V, 3000mAh, and i have a problem with overheating servo 2. (I mean a lot overheat). Can anyone please advise me on what to do? How can I fix it?

 

[Erebos]

@Erebos
Any progress with the overheating servo?

I tried to change the servo twice but both overheated, so I bought another one and miraculously it worked. It worked for two days without problems, it did not overheat. But today it stopped going out of nowhere. It did not overheat, but stopped spinning properly and I dont know why.. everything works except the servo 2.

 

[stevethesparks]

Have you checked their working voltage or confirmed they are suitable for the supply being used?