Question usb drives stop working on Amplifier

[wilshere10]

Hello, at work we have PA amplifier MA-181RU and when you plug in usb drive to play music it works great but it just randomly stop after some hours and it won't detect that usb drive ever again not matter do I format it or turn off/on amplifier. Same thing happend on three different usb drives. Any idea what could cause this and what could I try to do?

 

[hang-the-9]

Contact the vendor support, seems like there is an issue with the ports.