Drivo squeaking under power transitions

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My DRIVO recently, produces an irregular squeak, under power transitions, in the first 15' or at the end of the sessions when low power is applied. It is intermittent, so often nothing is heard! Sounds like something needs lube, or so...The trainer has nearly 4000km, it is operated under dry conditions and it is kept in the appartment. So far I had only greased a bit its' right side belt. Has anybody encountered similar noises?

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Here is the noise and general behavior
[https://youtu.be/LOJEPyMYdB4]

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https://youtu.be/LOJEPyMYdB4

[mgfjd]

Delete this post. I found the issue.. Unrelated to the thread.