i had some issues with one of my ADA1500 amps. what ended up solving the problem was putting a dual usb fan pumping in cool air into the unit. so now the amp stays cold to the touch and no extra noise, no channels that seem to drop out.

https://www.amazon.ca/gp/product/B08ZSRYH94/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

even on the mid setting the fans are silent from where I am sitting. With my current setup i had located each of the amps and lfr dsp inside a front cabinet that is under the TV. the added fan helped to keep them cool.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5