The problem of stopping in the middle of working

[seong-ro]

Thanks for your source code. Currently I am using it for esp32 cam. The battery is a device that uses two 18650 (3.6v 5.1Ah) two in parallel (7.2v) to connect two 7.2v digital servomotors to a 7.2v 10.2Ah battery and supply voltage to the eps32 cam with 5v.
When I upload the source, the wifi is also displayed well, the connection is good, and it works for 1 second without any problems, then I found a problem that one servo does not move. help.