Ouch it looks like the Isreali company lost their previous satellite too after 4 yrs of being in space:
http://www.haaretz.com/israel-news/business/1.687543
There is still no cause listed on Wikipedia.
> Industry experts described the total loss of contact with the satellite as a highly uncommon event.
This one was built by Russians for the first time. It looks like they went back to a domestic built one with SpaceX and it blew up. That's some bad luck :/