Sounds very weird indeed.
When connecting to the Mola Mola directly, are you using the Direct Stream Output on the K41, with the K41 connected to the internet via the Network port.
What is the ethernet cable? Do you have any filter between the K41 and Mola Mola?
Have you tried different cable?
Just to double check, you have Roon logged into the K41 as server, and the Mola Mola selected as Roon Ready, with the device setup correctly in Roon Ready.
The Mola Mola is max 24/192 via ethernet
I am having the same drop outs on Roon. My K41 is connected to Devialet Dual 1000Pro.
Thse drop outs are completelly random:
I can have multiple dropouts in one hour our I can have the music playing for several days without any problem;
The drop outs can be really fast almost unnoticed or they can last 7 or 8 seconds and then the music plays again…
My K41 is a G3 model (41B written on the transportation box). I purchased it second hand a couple of months ago. These dropouts are happening since early days.
Everything is properly connected and the ethernet signal is working well without breaks or failures.