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TRIED ALL YOUR MINI PC's
you're probably have problem in the Real Time Clock (RTC) AND IT'S NOT CMOS BATTERY PROBLEM
the real time clock just resets back to default time and date (December/2016 00:00)
i have more than 30 pcs of Intel NUC5CPYH updated to Bios version 0064 All of them are new.
bought at different dates
The reason is that i'm the only one who complains about that problem is because of i'm using this nucs in offline-mode and it's impossible to connect them to the internet for time synchronization always
i checked voltage of cmos battery - it's correct (3v) and you all agree with me that it can't be that more than 30 pcs has the same problem
1. THE TIME AND DATE ARE STOPPING FROM MOVING
2. SOME OF THEM ARE REVERTING BACK DECEMBER 2016 00:00
3. IN SOME OF THEM THE TIME AND DATE STOOPING/REVERTED TO DEFAULT WHEN THEY ARE PLUGGED OUT OF POWER FOR 3-4 DAYS OR SO...
I have big organization of my customers that i sold the nuc for them, and now they want to fill a lawsuit against me because of that! it's absolutely not a operating system related issue because i see the time and date stop / revert problem as soon as i hit F2 to the bios , before the operating system boots up and i tried also to remove the hdd and see if it happens to nucs that stays offline without hdd - it happens!
tried every scenario you could imagine , including replacing the cmos battery although it's new nucs units (3 weeks-2 months since opening the box maximum)
IT'S ABSOLUTELY a BIOS BUG that you never could test at your development because i guess you and most of your customers using them with an internet connected and time sync ability.
please solve this issue for me , i'm bagging you i'm here any time to do any test that you want online with you 24 else i will get into big trouble with my customers and lose big money.
NO CMOS ERROR / CMOS LOW BATTERY OR ANY ERROR MESSAGE IS LOGGED OR SHOWN DURING BOOT
Just for your notation According to this page CMOS Battery on the Intel® NUC
You tell customers that the CMOS battery do responsible for keeping the time running during power off for 3 years.
I'm sure this bug is not battery related issue after what i've tried
to test you must use a unit without any connection to the internet for time and date syncing