Server 2012 hangs after cmd reboot

Hi all,

I sometimes need to reboot a Windows 2012 R2 based on on DL380 Gen9, because one of my vm lose its network connection on Hyper-V, but it's not my main problem for the moment.
My main problem is that when I reboot it remotely via cmd and shutdown -r, it comes normally to logon screen, mouse is working on iLO, but I can't RDP on it or use CTRL+ALT+DEL on iLO. I'm obliged to reset it on iLO, which is a terrible idea but the only one working on my case. After that reboot it comes back normally every time.

I recently updated firmwares and BIOS via SPP.

Any ideas is welcome !

Thanks in advance