I didn't use my Spider V 30 for a couple months and today, when I tried to use it, I noticed it doesn't receive any input from the guitar jack (even in tuner mode no sound seems to arrive) and also from the aux mini jack.
If I enable demo mode, I can hear the sound from the speaker.
I tried upgrading the firmware and then I also performed a factory reset, but the problem is still present.
Note: if I connect an Android phone using the USB port and play something, the outputs is reproduced by the amplifier.