My Line 6 Spider III 120 watt guitar amplifier will frequently cut out on the sound, and the amp seems to turn off then back on and working quickly, followed by this process recurring. I have tried factory resets but it only helps briefly. What is wrong with it and how can this be fixed?

SOURCE: amp turns on but no sound even with diff guitars and cords

Hi Dan
I wish I could just say what to fix, but you can not do this at home. Line 6 is a great amp and worth the time taking it down to the music shop , to be looked at an give you a repair estimate. good luck keep on rocking in the free world. DFD

SOURCE: line 6 spider III 15 watt sound problems

Hi there. Sounds like the power amp IC is shorted. Must replace.
Paul

SOURCE: My Line 6 Spider 3 75 Watt amp is having trouble.

Try this site:http://line6.com/community/community/support

SOURCE: Spider III amp stopped making sound

After making sure your guitar cable is OK (they often cause the problem) check the inout jack on the amp. They often get broken by yanking cable sideways.

SOURCE: on any channel I've begun to get a intermittant

If this has a digital effects processor read on.., I had a SIMILAR problem on a Behringer GX110.

The electrolytic filter cap for the 5 volts of the DSP effects had gone bad. The 5 volts was dipping when the DSP reset and it would repeatedly reset causing a clicking at about once a second. 50 cent part fixed it. The part is a little undersized electrically so is more prone to failure in the unit I have.

That particular one had the DSP as a seperate board with its own 5 volt supply from the main transformer.