Hello,
If you volume knob on your guitar is open but you are not playing (allowing volume to come through) then this could be reverb/delay trails or feedback. If you have it set to tweek a particular effect this could be happening as well.
If this is not the case you should try a reflash of the unit.
Pod xt Series: Factory Reset, Reflash, and Firmware Updates
http://line6.com/community/docs/DOC-3827
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