Pod HD 300 suddenly change presets and even dont sound aftar playing one minute

[lovaspillando]

Hi!

 

I own an POD HD 300 that I use mainly for recording demos of my songs and sometimes for playing together with my amp (when with the amp in "FX Only" mode).  I bought about two years ago my second hand unit and now I star to have a so weird problem. 

 

After connecting and starting to play, in one or two minutes as maximum I see how the lights of amps and efectes start to change several times until they stop in red and sometimes even the unit has no sound.  In this m oment I can not even change nothing moving the knobs and if I change preset thing happenes again and again and again.

 

Anyone has any idea about why it happends and what can I do?  I am preparing the unit for one concert and its annoying for me.

 

Thanks so much in advance!