s11 hashrate issue

hi 

I've got a problem on my antminer s11 19TH

after i shutdown my device an turn it on its got a problem

after 30min working this is a result

Done check_asic_reg
Chain[0] Chip[69] pcb temperature=22
Chain[0] Chip[18] junction temperature=90
Special fix Chain[0] Chip[18] middle Temp = 37
Chain[0] Chip[132] pcb temperature=44
Chain[0] Chip[34] junction temperature=107
Special fix Chain[0] Chip[34] middle Temp = 59
Done read temp on Chain[0]
Chain[1] Chip[69] pcb temperature=20
Chain[1] Chip[18] junction temperature=95
Special fix Chain[1] Chip[18] middle Temp = 35
Chain[1] Chip[132] pcb temperature=43
Chain[1] Chip[34] junction temperature=106
Special fix Chain[1] Chip[34] middle Temp = 58
Done read temp on Chain[1]
Chain[2] Chip[69] pcb temperature=22
Chain[2] Chip[18] junction temperature=91
Special fix Chain[2] Chip[18] middle Temp = 37
Chain[2] Chip[132] pcb temperature=44
Chain[2] Chip[34] junction temperature=103
Special fix Chain[2] Chip[34] middle Temp = 59
Done read temp on Chain[2]
Max pcb temp : 44
FAN PWM: 57
read_temp_func Done!
CRC error counter=631

and hash rate is below than the 19TH

rt:

17,778.65

avg:

please help me