Maybe someone can help me with following problem: I have a Pioneer GM-X904 amplifier, which worked brilliantly for years, however recently it shuts down after 1-2 minutes. When I take the power off and put it back on it works again.... for 1-2 minutes. Could the internal fan be broken, so system shuts down when this fan is triggered? Please note, system does play when using very low power and casing does get warmer. When turning volume up, system shuts down again. Does anyone have similar issues and if so how can I fix this? Thanks in advance!