avalon miner 1246 n 90th/s, it will smoothly forhalf an hour and will start screaming. some chips are over heating and i thought its due to poor thermal paste so i replace with new thermal paste(drg102) but the same problem after 15 minutes.. any suggestion guys?

{'STATUS':[{'STATUS':'S','When':560,'Code':11,'Msg':'Summary','Description':'cgminer 4.11.1'}],'SUMMARY':[{'Elapsed':781,'MHS av':70697370.78,'MHS 30s':79499879.60,'MHS 1m':77492968.63,'MHS 5m':68941887.35,'MHS 15m':42083890.70,'Found Blocks':0,'Getworks':80,'Accepted':421,'Rejected':0,'Hardware Errors':7,'Utility':32.35,'Discarded':4546289,'Stale':0,'Get Failures':0,'Local Work':12868,'Remote Failures':0,'Network Blocks':2,'Total MH':55490152663.0000,'Work Utility':992647.73,'Difficulty Accepted':12314949.00000000,'Difficulty Rejected':0.00000000,'Difficulty Stale':0.00000000,'Best Share':13745394,'Device Hardware%':0.0001,'Device Rejected%':0.0000,'Pool Rejected%':0.0000,'Pool Stale%':0.0000,'Last getwork':0}]}
{'STATUS':[{'STATUS':'S','When':560,'Code':70,'Msg':'CGMiner stats','Description':'cgminer 4.11.1'}],'STATS':[{'STATS':0,'ID':'AVA100','Elapsed':781,'Calls':0,'Wait':0.000000,'Max':0.000000,'Min':99999999.000000,'MM ID0':'Ver[1246-N-90-23021601_66620f1_27c9e34] DNA[0201000084f8280f] MEMFREE[1214312.1208240] NETFAIL[0 0 0 0 0 0 0 0] SYSTEMSTATU[Work: In Work, Hash Board: 3 ] Elapsed[781] BOOTBY[0x04.00000000] LW[753319] MH[2 5 0] DHW[3] HW[7] DH[0.412%] Temp[29] TMax[92] TAvg[75] Fan1[3080] Fan2[3047] Fan3[3090] Fan4[3055] FanR[37%] Vo[310] PS[0 1219 1243 215 2677 1244 2867] PLL0[263 27 106 14964] PLL1[209 9 54 15088] PLL2[116 25 102 15117] GHSspd[75321.74] DHspd[0.412%] GHSmm[75773.37] GHSavg[70960.79] WU[991310.79] Freq[411.10] Led[0] MGHS[23992.92 23368.64 23599.23] MTmax[91 92 87] MTavg[75 77 73] TA[360] Core[A3200] PING[60] POWS[0] HASHS[0 0 0] POOLS[0] SoftOFF[0] ECHU[0 0 0] ECMM[0] SF0[354 374 394 412] SF1[354 374 394 412] SF2[354 374 394 412] PVT_T0[ 72 74 80 84 76 78 74 74 88 88 75 74 74 73 88 89 79 75 74 76 91 89 76 75 76 76 91 87 78 76 70 76 90 86 79 70 71 77 87 86 76 69 69 78 86 87 73 69 73 71 84 79 69 67 66 69 78 75 64 66 64 63 75 75 63 64 65 66 69 77 69 69 68 73 73 72 69 74 67 71 80 77 76 69 68 77 81 73 70 74 74 73 69 69 79 71 71 69 69 70 72 72 72 75 72 73 71 72 71 70 71 74 73 72 76 72 74 71 69 72] PVT_T1[ 75 76 83 86 75 79 75 78 86 87 76 76 79 77 89 90 75 81 75 79 91 92 83 73 77 79 91 87 77 79 77 76 91 90 79 79 76 78 90 90 77 70 78 72 91 88 74 68 69 75 80 80 73 70 70 73 78 74 70 67 67 66 62 64 70 64 67 70 68 78 79 64 68 78 80 77 74 70 72 78 69 73 75 83 85 80 79 76 73 69 74 78 78 79 79 76 74 72 70 72 70 74 74 76 73 74 75 76 74 72 71 71 74 73 72 73 69 71 72 78] PVT_T2[ 69 75 80 84 77 69 69 76 85 85 72 69 79 75 86 84 76 79 74 74 81 82 76 74 79 74 86 87 74 75 70 72 87 84 74 70 69 74 86 82 73 69 69 69 82 82 71 71 72 67 78 73 69 70 66 67 76 74 69 67 65 66 65 64 67 63 67 64 64 68 69 71 71 72 74 73 74 68 69 67 69 70 71 68 73 69 70 67 75 82 82 70 68 72 70 80 76 66 69 66 71 84 74 70 73 69 73 74 71 72 69 66 71 70 71 73 66 64 69 70] PVT_V0[292 294 298 283 282 283 286 289 288 282 283 286 289 287 283 284 286 286 279 276 277 279 283 285 277 279 276 274 277 277 286 283 281 286 283 284 279 279 278 285 284 285 283 283 281 284 285 286 289 289 288 289 291 291 293 297 297 291 295 302 301 299 294 293 297 297 301 302 299 294 298 296 294 294 294 294 292 292 295 292 292 290 291 289 292 291 292 301 301 299 296 297 295 290 293 292 299 295 296 292 292 292 292 290 293 293 294 292 291 292 290 296 294 296 292 290 290 294 295 299] PVT_V1[283 287 293 287 289 284 281 281 282 282 285 284 287 287 287 282 282 281 279 281 277 280 281 283 271 275 275 275 278 280 282 281 277 283 282 284 282 281 281 283 287 288 274 279 280 285 291 291 290 289 289 293 298 297 297 295 298 293 298 302 309 307 304 302 301 301 306 305 306 292 291 294 294 292 289 290 289 288 289 290 288 290 291 288 287 286 287 290 292 290 290 290 294 293 295 297 297 297 296 292 292 293 290 290 293 294 294 291 296 295 298 294 294 297 294 294 294 294 293 298] PVT_V2[291 293 295 287 287 287 291 288 289 286 289 287 282 282 279 283 283 280 285 283 283 279 286 285 282 283 280 278 281 281 286 287 288 282 282 283 282 284 281 281 285 285 292 291 290 285 288 287 292 291 291 292 291 293 299 300 297 292 297 301 305 298 294 301 303 305 299 299 300 299 298 297 291 292 290 295 295 295 297 298 298 290 292 293 289 289 288 289 290 287 296 295 296 290 289 287 294 296 298 285 287 285 287 288 290 294 294 292 294 292 290 289 291 291 293 292 292 297 300 299] MW[251106 251137 251076] MW0[16 20 23 8 29 19 10 14 16 18 15 21 14 18 18 18 17 13 16 17 16 14 17 15 12 17 19 16 12 22 23 15 18 13 25 18 27 17 17 21 18 23 21 17 16 13 23 18 17 16 19 17 16 15 17 17 20 21 23 21 22 19 15 22 23 24 25 15 18 18 17 24 13 17 18 22 10 18 18 18 22 19 18 21 14 16 17 22 11 23 22 12 15 18 14 14 23 13 16 21 26 17 19 13 17 24 20 20 24 19 22 19 22 9 16 21 24 15 22 15] MW1[22 12 14 21 21 16 26 13 12 17 24 14 15 18 23 18 24 17 19 17 17 20 20 25 18 13 19 15 12 15 24 12 12 12 11 19 22 22 22 16 24 18 21 19 20 16 16 18 24 14 18 27 10 13 20 21 15 9 15 19 24 15 14 12 16 16 20 20 14 28 12 15 19 22 18 16 10 16 25 15 14 16 19 20 11 9 20 26 24 13 14 19 16 19 18 22 17 20 19 18 18 19 28 20 11 10 25 15 17 15 10 19 16 21 19 20 15 18 17 19] MW2[16 16 21 19 14 15 15 13 16 21 20 27 8 18 13 14 18 14 21 16 17 18 21 16 24 26 15 19 19 26 19 18 20 21 19 20 21 11 19 19 21 21 16 14 24 19 19 17 15 14 14 22 21 13 18 18 15 25 23 18 17 22 11 15 20 17 11 19 13 16 18 14 12 21 20 8 17 22 17 16 21 17 17 14 24 18 20 17 18 17 19 17 16 18 18 29 18 23 15 17 16 21 24 12 7 10 16 19 20 18 19 21 19 10 20 19 19 13 31 15] ASICCRC0[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC1[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC2[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] CRC[0 0 0] POW_I2C[OK] FACOPTS0[] FACOPTS1[] FACOPTS2[] ATAOPTS0[--avalon10-freq 354:374:394:412 --avalon10-voltage-level 36 ] ATAOPTS1[--avalon10-freq 444:464:484:504 --avalon10-voltage-level 45 ] ATAOPTS2[--avalon10-freq 444:464:484:504 --avalon10-voltage-level 45 --power-level 0] ADJ[1] RPD[0] COP[0 0 0] MPO[3250] MVL[87] ATABD0[444 464 484 504] ATABD1[444 464 484 504] ATABD2[444 464 484 504] WORKMODE[0]','MM Count':1,'Smart Speed':1,'Voltage Level Offset':0,'Nonce Mask':25}]}