camera error "Turn power off then on"

I used my sony a7s ii since last 16 months and it’s brilliantly performed but now couple of days i have this problem,

camera show on start “ Camera Error “ and in second line “ turn power off then on”

and if i shake my camera so it’s on but some time stabilizer are not working properly and footage come to shaky.

Please guide me.

Thanks and regards,

Ali Sharey