Faulty Behringer Euro Live B115d

One possibility is that the speaker is overheating. This can happen if the speaker is used too loudly, or if it is used in a hot environment. If the speaker overheats, it will automatically turn off to protect itself from damage.

Another possibility is that the speaker is experiencing a power supply issue. This could be due to a faulty power supply unit, or to a problem with the wiring. If the speaker is not receiving enough power, it will turn off.

Finally, it is also possible that there is a problem with the speaker's internal circuitry. This could be due to a faulty component, or to a manufacturing defect. If the speaker's internal circuitry is not working properly, it may turn off intermittently.

If you are not sure what is causing your speaker to turn off, it is best to take it to a qualified technician for diagnosis and repair.

Here are some things you can try to troubleshoot the issue:

Make sure that the speaker is not overheating. If the speaker is hot to the touch, turn it off and let it cool down before using it again.

Try using the speaker in a cooler environment. If the speaker is turning off in a hot environment, try moving it to a cooler spot.

Check the speaker's power supply unit and wiring. If you find any problems, replace the faulty components.

Take the speaker to a qualified technician for diagnosis and repair if you are not sure what is causing the issue.

Please note that I am not a qualified technician, and this advice should not be taken as a substitute for professional diagnosis and repair.