It is now 2020 and I am using OA 4.85 and the problem still occurs.
The OA rebooted itself after running out of memory. To be sure it wasn't a one-off, I tried again. Sure enough, it restarted itself again.
I have done this operation countless times successfully with iLO2 and earlier releases of OA.
Apr 9 10:33:32 OA: Proliant iLO firmware update attempted by user Administrator
Apr 9 10:39:05 Kernel: Out of Memory: Kill process 1112 (httpd2) score 5476 and children.
Apr 9 10:39:05 Kernel: Out of memory: Killed process 1113 (dvd.iso).
Apr 9 10:39:05 Kernel: Out of memory: Killed process 1122 (dvd.iso).
Apr 9 10:39:05 Kernel: Out of memory: Killed process 1123 (dvd.iso).
Apr 9 10:39:37 OA: System Out Of Memory
Apr 9 10:39:50 Kernel: Out of Memory: Kill process 1112 (httpd2) score 5128 and children.
Apr 9 10:39:50 Kernel: Out of memory: Killed process 1129 (dvd.iso).
Apr 9 10:39:50 Kernel: Out of memory: Killed process 1130 (dvd.iso).
Apr 9 10:39:50 Kernel: Out of memory: Killed process 1131 (dvd.iso).
Apr 9 10:40:44 Kernel: Out of Memory: Kill process 1112 (httpd2) score 5344 and children.
Apr 9 10:40:44 Kernel: Out of memory: Killed process 1139 (dvd.iso).
Apr 9 10:40:44 Kernel: Out of memory: Killed process 1140 (dvd.iso).
Apr 9 10:40:44 Kernel: Out of memory: Killed process 1141 (dvd.iso).
Apr 9 10:40:45 Kernel: Out of Memory: Kill process 1112 (httpd2) score 4388 and children.
Apr 9 10:40:45 Kernel: Out of memory: Killed process 1150 (dvd.iso).
Apr 9 10:40:45 Kernel: Out of memory: Killed process 1151 (dvd.iso).
Apr 9 10:40:45 Kernel: Out of memory: Killed process 1152 (dvd.iso).
Apr 9 10:40:45 Kernel: Out of Memory: Kill process 5906 (httpd2) score 3922 and children.
Apr 9 10:40:46 Kernel: Out of memory: Killed process 6508 (hpoa).
Apr 9 10:41:45 Kernel: Out of Memory: Kill process 1112 (httpd2) score 5464 and children.
Apr 9 10:41:45 Kernel: Out of memory: Killed process 6619 (dvd.iso).
Apr 9 10:41:37 OA: SEGV /ramdisk/lcd/menu (pid=104) Address accessed 0x8. IP=0x300f98ec,Link=0x300f98e4
Apr 9 10:42:29 OA: Function callback 0x300f98e4 0x300f98e4 0x30854450 0x10009b08
Apr 9 10:42:32 Kernel: Out of Memory: Kill process 1112 (httpd2) score 5338 and children.
Apr 9 10:42:32 Kernel: Out of memory: Killed process 6692 (dvd.iso).