If you can post the contents of the cgboot and voltage files located in the config folder it will give me a better idea of what is going on. Minus your wallet id

Looks like it jumped back into a different freq mode. I had another have a issue where is was going inot scan mode when it shouldnt and set the freq different. The bug is being looked into. I so far havent been able to duplicate the issue and will keep looking into it. It may be a a timing issue as to the cgminer restarting after applying setting and will be testing some things today to see if it fixes the problem.

root@antMiner-1:/config# ls
cgboot                  dropbear                lighttpd-htdigest.user  network.conf            user_setting
cgminer.conf            dropbear_rsa_host_key   mac                     shadow                  voltage
root@antMiner-1:/config# cat cgboot
echo 00041854: 8403 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003B160: 07C3 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003B2D4: 07C3 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003B53C: 0763 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003E534: 0743 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003E7A0: 0723 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003EAC0: 0753 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0003EBB0: 0723 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 00041828: 0723 | /usr/bin/xxd -r - /usr/bin/cgminer
echo 0004194C: 0703 | /usr/bin/xxd -r - /usr/bin/cgminer
root@antMiner-1:/config# cat voltage
{
"bitmain-freq-user" : "775",
"bitmain-freq-hex" : "073",
"bitmain-voltage" : "900",
"bitmain-voltage-hex" : "8403"
}

775 could run at about 900-920mv. The fan is always in auto with the latest version because it is based on the latest bitmain release which fixes the NH issues. I am going to release a non NH version later tonight or tomorrow which should fix some other issues also.

The freq and voltage is set if it doesnt take the first time click save settings again. I have had a couple reports that some z11's are acting funny with it. I am looking into it today to see why some it is fine and others it is not setting correctly

Miner Type   Antminer Z11 Chipless Free
Hardware Version   9.0.0.5
Kernel Version   Linux 4.6.0-xilinx-gff8137b-dirty #22 SMP PREEMPT Fri Dec 22 12:25:44 CST 2017
File System Version   Sat Jul 6 23:34:47 CST 2019 (Chipless v2.1 Free Version - Buy Private for Higher Mhz. Freq selections)
CGminer Version   4.9.0

root@antMiner-1:/# cat /config/cgminer.conf
{
"pools" : [
............
]
,
"api-listen" : true,
"api-network" : true,
"api-groups" : "A:stats:pools:devs:summary:version",
"api-allow" : "A:0/0,W:*",
"bitmain-use-vil" : true,
"bitmain-freq" : "775",
"bitmain-voltage" : "900"
}

AntMiner
Chain#   ASIC#   Frequency   Ksols/S(RT)   HW   Temp(PCB)   Temp(Chip)   ASIC status
1   3   731   51.77   0   59   79   ooo
2   3   731   43.25   0   60   82   ooo
3   3   731   39.32   0   60   83   ooo