Why my laptop freezes when left ideal for like 7-10 min ? and it only happens when laptop is on charging..on battery it’s perfect..power management is applied

i3 3227U 1.9ghz HD graphics 4000 8 GB DDR3 SMBIOS- MacBook Air 5,2 Boot loader-Opencore 0.5.9 All energy saver options are unmarked as well as all hibernation options are disabled by commands