[Jackaudio] Glitches when adding connections

Dear list, I'm doing some experiments to use Jack and NetJack to connect several machines. Here I'm using two Linux machines : a debian as client and  mint 20 as server (sorry I'm not confortable with the "master" "slave" keywords in this context). I'm sending 32 channels from client to server. By the way, this works great and is very intuitive. Though, for some reason, when I connect these inputs to something (here to Reaper), audio is great until I connect the 26th input to Reaper. Then it starts glitching (sounds like interruption) and gets worst if I keep increasing the number of connections. If I remove connections to keep it less than 26, it sounds ok. Never had this problem before. Is it likely related to NetJack ? Or does it sounds like a pure Jack issue ? Thanks for any help or advice Regards -- Johann PHILIPPE Electroacoustic composer & computer music designer +33 6 77 20 98 41