S7 Hash Rate lower than 3 TH

[30ppp]

I have an Antminer s7 , It works properly .
But yesterday it stopped working and I had to restart it.
After restarting it hash rate stuck in 3 TH .
I checked "kernel log" and I found the below failed errors.
can any body tell me what is the problem ?
-----------------------------
2.958509] bone-capemgr bone_capemgr.8: bone: scan failed (1 time)
[    3.497572] bone-capemgr bone_capemgr.8: bone: scan failed (2 time)
[    4.036629] bone-capemgr bone_capemgr.8: bone: scan failed (3 time)
[    4.575690] bone-capemgr bone_capemgr.8: bone: scan failed (4 time)
[    5.114753] bone-capemgr bone_capemgr.8: bone: scan failed (5 time)
[    5.653815] bone-capemgr bone_capemgr.8: bone: scan failed (6 time)
[    6.192880] bone-capemgr bone_capemgr.8: bone: scan failed (7 time)
[    6.731940] bone-capemgr bone_capemgr.8: bone: scan failed (8 time)
[    7.271002] bone-capemgr bone_capemgr.8: bone: scan failed (9 time)
[    7.810065] bone-capemgr bone_capemgr.8: bone: scan failed (10 time)
[    8.318047] bone-capemgr bone_capemgr.8: Failed to scan baseboard eeprom
[    8.325115] bone-capemgr: probe of bone_capemgr.8 failed with error -110
[    8.334647] nand_get_flash_type: 2c,da against 2c,da
[    8.340174] ONFI param page 0 valid
[    8.343846] ONFI flash detected
[    8.347165] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP), 256MiB, page size: 2048, OOB size: 64
[    8.359075] omap2-nand: detected x8 NAND flash
[    8.363739] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme
[    8.369341] omap2-nand: using custom ecc layout
[    8.374179] 10 ofpart partitions found on MTD device omap2-nand.0
[    8.380569] Creating 10 MTD partitions on "omap2-nand.0":
[    8.386240] 0x000000000000-0x000000020000 : "spl"
[    8.393127] 0x000000020000-0x000000040000 : "spl_backup1"
[    8.400582] 0x000000040000-0x000000060000 : "spl_backup2"
[    8.407995] 0x000000060000-0x000000080000 : "spl_backup3"
[    8.415271] 0x000000080000-0x000000240000 : "u-boot"
[    8.423527] 0x000000240000-0x000000260000 : "bootenv"
[    8.430498] 0x000000260000-0x000000280000 : "fdt"
[    8.437122] 0x000000280000-0x000000780000 : "kernel"
[    8.448131] 0x000000800000-0x000001c00000 : "root"
[    8.471544] 0x000001c00000-0x000003000000 : "config"

[notlist3d]

What does status screen show?  Does it list all chips as there?   Have you made any changes with restart as if you just turned power off/on it really should not have changed anything.

Are you able to post a picture of status screen?  Also what batch S7 is it?

[FUBAR-BDHR]

Check all your power connections.  Screenshot would be the best though.

[Legacy2005]

Check all your power connections.  Screenshot would be the best though.

also what psu are you using? 1 for the whole machine (1600w evga/bitmain psu) or are you using 2 different psu (2 1300w evga)?