If a speaker stops playing, the following steps can be taken to correct the problem:

The wiring should be checked to ensure that the speaker cables are properly connected and that none of the cables are damaged or loose. The connection of the cables at the source or amplifier should also be checked.

The amplifier settings should be checked to ensure that the speakers are set to the correct source and channel. It should also be checked that the volume is high enough and that the mute function is disabled.

The speakers themselves can be checked to see if the speaker itself is faulty. It can be helpful to test each speaker individually by connecting only one and playing music. If no sound is heard from the speaker, the speaker may be faulty and need to be repaired or replaced.

The source should be checked to ensure that the signal is correct. For example, if a device is connected via Bluetooth or AUX cable, make sure the connection is stable and the signal is not interrupted.

If the speaker has a fuse, it can be checked to see if it is defective. A defective fuse can prevent the speaker from working.