We have a HP dl360G3 with upgraded bios (P31 03032005) and do not use Broadcom nic's instead we use a Intell ce 1000 giga (driver 7.63 from Nov last year) nic whit tcp 659i, BM 3.8 sp3 ir1 and NW 6.5 sp3.
The BM is serving 9 school's, around 400 nodes and 2000 users and hangs spontanosly every day, ther can be as few as 10 conections when it hangs.
There is nothing in any loggs to give a clue.