ipad deep sleep mode

i am currently experiencing some issues after i updated my Ipad Mini 3 from IOS 8.1 to 8.1.1 . my ipad mini 3 will go into a deep sleep mode like as if i turned it off. at first i thought the battery was empty , then i saw that the battery was at 34% when i got it back on. for me to get it back on , i had to hold down the power and home button together. if i hold down the power button only it will not come on. it is very strange, i hope it can be fixed or patched