Brother MFC L2740DW now working 4.15.0-126-generic, cinnamon v3.6.7, Mint 18.3 64bit
1) Occasionally computer seems to get "congested". Becomes so slow that a reboot is the quickest way to get it back to normal speed.
2) computer will lock up after periods of no use. May require multiple sequential power cycles to boot.
load all updates as update manager presents them