Uni Fan SL Inf Wireless suddenly stopped working

Hello,

2 of my Lian Li Uni Fan SL Inf Wireless suddenly stopped working. Everything was working fine and today I started my PC and Noticed 2 of the fans were spinning very slow and RGB didnt work.
I have connected every group of fans to the motherboard and the wireless USB Controller also. These 2 fans sometimes stop spinning completly.

I tried another motherboard Sys-Fan connection which is working but the fans didnt work. I cant change fan profile and rgb in L-Connect3.
It seems like the fans just broke.
Is there something I dont see before I try the RMA?
I would appreciate every type of help
Thanks!