Amp2 - Clicks/pops after 30minutes of music - seems an overheating issue


I got clicks in one of the speakers while both fade out for a second after 30 minutes of playing. I use volumio with an amp2 on a headless RPI3, flacs on an usb stick and 6ohms speakers (infinity Ref 31i). The psu is a Mean Well 18v, 3.33A (GS60A18-P1J). Same thing happens with a 12v Ktec psu.
The case is an universal Hifiberry. 

It seems to me that it might be of an overheating origin because the problem vanishes for a while when I take the lid off the case and ventilate the amp a bit.

I guess the closest forum post would be these :
https://support.hifiberry.com/hc/en-us/community/posts/360005891769-Amp2-Sound-is-popping?input_string=Amp2%20-%20Clicks%2Fpops%20after%2030minutes%20of%20music%20-%20seems%20an%20overheating%20issue, https://support.hifiberry.com/hc/en-us/community/posts/115003016225-AMP2-overheating-playing-music-at-20-
and https://support.hifiberry.com/hc/en-us/community/posts/360004873638-Playback-has-intermittant-clicking

But comments are closed so I began a new thread. Both threads ended with "we gonna open a ticket for this". Are there any news ?
Best regards, Patrick

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