Thank you so much psarkissian for your reply! Yes, this is a jtv-69s. The helix firmware is also up to date but this seems to be a variax specific issue. Meaning, variax modeling crashes while on battery power and disconnected from the helix when the tone knob is turned up to 10. I haven’t ever broken a string on this guitar - it is seldom used. Magnetic pickup mode works great as well but something bad is happening when the tone pot hits full (10) in model mode. Thank you!