What hardware or server model are you running with ESXi? And by the way, the T710 is not supported to run ESXi 6.5.
is it an issue with your iLO not showing anything on the screen or you are saying that it gets hung up and does not respond to ping responses. ?
I faced above issue where iLO got hung up and did not showed anything on the remote console. But in that case i was able to ping and connect to the esxi.
If this is the same issue then update the iLO firmware/Driver version with latest
I think may be the hardware but is strange that for month works fine after the crash, may be a input output disk error, don't know, i can't see nothing because when hungs the screen are off,
I don't know if is a ilo error.