Hi Anders,
It sounds like multiple amps were showing this same error?
I would recommend replacements. PowerMatch amplifiers are under Global Rapid Response through March of 2013 so please return the amp through the proper channels so it can get back here for analysis. Please submit a Front Door issue as well so that we can track this. Feel free to reference this post in the issue description.
When you get the new amps, please ensure the latest firmware (1.153) is on there. If you have any other details about the loudspeaker loads/CSD files, please email us those directly.
Thanks,
Kyle