Previous owner on my 16 JKU upgraded the sound system in the Jeep. Ever since I bought it, if I turn the radio volume below 10 the speakers will cut out completely. The head unit is still on though. Then it will sometimes come back on or if I turn the volume up one or two clicks it will come back on. There is a sub in the back and amplifier under the drive side seat I believe. Does anyone have any suggestions as to what may be the issue here? I am not super familiar with sound upgrades. Thanks!