not sure on the cutting out, could be to do with the electrics as its intermitant, try taking the tank off and on the LHS taking out the connectors cleaning and then greasing and reconnecting.

as for the rear wheel bearings if your Cush drive runners are worn this can put stress on the bearing especially if
you've packed them out with inner tube and it's been packed wrong. I went through wheel bearings and sprocket bearings a few times then noticed that every time the packing was putting a minor wobble onto the rear sprocket then after a while it would get worse and then fail

__________________
Plough on