Question MSI H97M-E35 All setting were reset to default values Error Problem

[Ichtech]

i have msi motherboard type H97M-E35 bought it around 4 years ago. and got the problem occured when booting
it say "all setting were reset to default values F1 to run setup and F2 to continue " if i press f2 to continue its going restarted/rebooting and working perfectly nothing error occured , if i press f1 its goes to bios setting and nothing happens. it will happen if i shutdown my PC and turn off any electricity to my computer , after a while if i try to turn on my PC it will appear same problem. this problem never appear before and i didn't touch any setting on bios , no overclocking. the time , day and year perfectly fine on bios. im not adding any new hardware.
im already tried with update/flashing to new updated bios but the problem is still there.
updating my windows 10 to the latest update.
what should i do?? i have no idea.
my full specs:
Mobo : MSI H97M-E35
proc: intell haswell refresh i5-4460
memory : 2x4GB team elite plus
PSU : coolermaster G450M 450W
GPU: pallit superjetstream GTX960 2GB
SSD Adata 120Gb
HDD seagate 2Tb and 500gb WD blue
mouse keyboard: logitech k120
is it CMOS battery failure or what? my time , day and year on bios is not changed
im afraid to touch them since they have warranty sticker on it
please help

 

[popatim]

Replace the little battery on the motherboard.
Watch a video first so you don't break anything.