Antminer s9 stop working after few hours

[RamboBambo]

After about a week of stable work, S9 stops. The green LED on the housing instead of flashing was constantly on. After reboot, everything theoretically returned to normal. Now the s9 can not work 24 hours without restarting. On average, after 6-12h, one disc is turned off (as in the picture below), after a while the second and finally the third.  GH / S (RT) is going down while GH / S (avg) shows normally. Please help
https://i.imgur.com/j6gkjpE.png