I kept 3 of my E3 .. another ones sold in August 
2 of those i kept, have 1-2-3 non functional chain , those are hashing fine as of today
1 have all the chain working , and that's one went offline this morning ...
tried everything , just in case replaced psu , unplugged 1 -2 blades , re-fleshed the firmware ...still nothing
So its time when those e3'become a paper weight or door stops... or whatever 
2 of those i kept, have 1-2-3 non functional chain , those are hashing fine as of today
1 have all the chain working , and that's one went offline this morning ...
tried everything , just in case replaced psu , unplugged 1 -2 blades , re-fleshed the firmware ...still nothing
So its time when those e3'become a paper weight
or door stops... or whatever