I bought a DSL1CR as a practice amp recently, sound was cutting out so sent back and bought another replacement DSL1CR from another vendor.  Received the replacement -- same issue, sound cuts out.  Goes from a 4 to a 1-- then back again... round and round we go..  Have done troubleshooting w/ cable & guitar (brand new Fender Telecaster) -- those aren't the issue.  Thoughts?  I hate to return again-- love the sound... with the caveat: when it works;) 

Any one else hearsd of this issue/ how to rectify?  

Thanks!