I have the same errors, not been getting any stakes for a long time, used to be every few days. Now more then a month with some 27000GRC.

CreateCoinStake: Found Kernel; 08/28/17 05:28:52 CreateCoinStake: added kernel type=1 credit=5558.393716 08/28/17 05:28:52 StakeMiner: created rest of the block 08/28/17 05:28:52 Received block ebb18c8468d1ea9060fa5102c74dc288387ff273933d416a57c0e5eb8682bdbd; CreateGridcoinReward: for 0f4e985a4ce2a311305c6509f16b30a3 mint 140.903901 {RSAWeight 30.000000} Research 136.167014, Interest 4.736936

08/28/17 05:28:52 StakeMiner: added gridcoin reward to coinstake 08/28/17 05:28:52 StakeMiner: signed boinchash, coinstake, wholeblock 08/28/17 05:28:52 ERROR: Bad CPID or Block Signature : height 1006051.000000, CPID 0f4e985a4ce2a311305c6509f16b30a3, cpidv2 0f4e985a4ce2a311305c6509f16b30a33dc53b6cc53a3c38374165c8383fc7623641673a3dc867c7383767979695999763626e63626e63626e7b6663626e41757679757362646c2f707368, LBH 8fe32193817177c7f4c1aedb72d2f36073ba1cf73d15524324ff2e263a46a0bf, Bad Hashboinc 0f4e985a4ce2a311305c6509f16b30a3<|><|><|>0<|>0.00000<|>0<|><|><|>0<|>0<|>v3.6.0.2-unk<|>136.17<|>0<|>0<|>0f4e985a4ce2a311305c6509f16b30a33dc53b6cc53a3c38374165c8383fc7623641673a3dc867c7383767979695999763626e63626e63626e7b6663626e41757679757362646c2f707368<|>30<|>S38x3zyK6Bic7UHUznJpDd4WrCzKRTdEt5<|>8fe32193817177c7f4c1aedb72d2f36073ba1cf73d15524324ff2e263a46a0bf<|>4.74<|><|><|><|><|>136.17<|>20.749259<|>0.175000<|>37.50<|>3062d7c3bea1fc6251d6fece71f9aaf067ba0a7bfe355eb44e05c32f4b5d730c<|>d41d8cd98f00b204e9800998ecf8427e<|>04136baea108b6acc4343ef4d693d187d5494ac75c9fbd2c377ef8771de405cf2e336c67fbacb4702bd9db5ff6855127ec4ec962b390b57dfc631578f53d9d52dc<|>MEQCIG3uQ5rn+ftuu2L4z6doz35zOV+i3q9D4cfEOCxu5SGzAiARIpAsdALivSaIi4nssAJEQ8coPZD3g5Gp6dI+Y4m/rg== 08/28/17 05:28:52 ERROR: ProcessBlock() : CheckBlock FAILED 08/28/17 05:28:52 ERROR: StakeMiner: Block vehemently rejected

08/28/17 05:28:53 Received block b1918799a3af573d8da071fb010dbe914aabdebe768aae66396ef99aee5ad5e4; Received block b1839177ab1ad7b64b587f42985666570f5fd03da33dbccd383a346d800fcd60; Received block 71f2674890c7d271008e8c0209cff67e36dea3b15eae3b6ac80357480319d98f; Received block 72991f742d49c46edf01293a0780b855ba3de5d31279e3a216f9930760fa4e11; Received block dfab65658485e79eff4e61af99ecb5867f5bbb784015a1d3c6d2c09837bbad99; Received block ca962513a8adcb28c968059988a95d899e3cc90dc47cb25a4d9df889d2d35afc; Received block e44b2421d67c9f47336972582dadf9fb23b0a7769016138e306cda742519f1ad; Received block af4423a519d3de0723f8109cfc3dc9ff7de16f28afcde643bb546207fe3265ec; Received block 1504444b293486c890d3bf8a909566f9df8dc888c2b8841594b668f9be452d5e; Received block df1534fab2fc1f499dc9569542a916038a0f5a3992124d5051b03440d3493bf7; Received block 1504444b293486c890d3bf8a909566f9df8dc888c2b8841594b668f9be452d5e; Received block 6d2a64049f9e78f6eadc3583644616b2e62c22cc6f437641bc09483d8d286c70; Received block df1534fab2fc1f499dc9569542a916038a0f5a3992124d5051b03440d3493bf7; Received block 25634ca06fccf6ad5053ad075e6c125d123948b2366a05bcf70114e31132a67a; Received block e1ee12d5b4817960f67cc1d21483ca3984607f62cd4e68ba0338c8264fe3ce03; Received block 71f2674890c7d271008e8c0209cff67e36dea3b15eae3b6ac80357480319d98f; Received block 8434f26fe8692593ca4253ffeff7f67d723317e85c09db5a0c59146cf721d332; Received block a4841e59482baa688dcde58ce661c74dff77f522add80bbd49221fb059c4c116; Received block ebb18c8468d1ea9060fa5102c74dc288387ff273933d416a57c0e5eb8682bdbd; Received block ca962513a8adcb28c968059988a95d899e3cc90dc47cb25a4d9df889d2d35afc; Received block ef44a2e12a4ea85743aaea525311d5e7dbbeac36b3f77ba2c7bae80fe54cd83e; Received block e1ee12d5b4817960f67cc1d21483ca3984607f62cd4e68ba0338c8264fe3ce03; Received block b1839177ab1ad7b64b587f42985666570f5fd03da33dbccd383a346d800fcd60; Received block 0595031d670346d5fe23eb97a3e33d8af7d7a833b130cae749442d0006fb4ae9; Received block ebb18c8468d1ea9060fa5102c74dc288387ff273933d416a57c0e5eb8682bdbd; Received block 72991f742d49c46edf01293a0780b855ba3de5d31279e3a216f9930760fa4e11; Received block b1839177ab1ad7b64b587f42985666570f5fd03da33dbccd383a346d800fcd60;