This is an extract of debug.log:
2019-01-01 22:34:30 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
2019-01-01 22:34:33 UpdateTip: new best=ae8c37c06f5da0486c438bd6ef0e403c0ccd3481c4c8fed2ff48f990b527f780 height=384 version=0x20000000 log2_work=28.588737 tx=385 date='2019-01-01 22:34:30' progress=1.000000 cache=0.0MiB(324txo)
2019-01-01 22:34:35 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
2019-01-01 22:34:43 UpdateTip: new best=1f94f804b286ef3a80f239e860b64e094abb823eee1e311edb1d857a8d9ae28b height=385 version=0x20000000 log2_work=28.592479 tx=386 date='2019-01-01 22:34:38' progress=1.000000 cache=0.0MiB(325txo)
2019-01-01 22:34:45 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
2019-01-01 22:34:58 UpdateTip: new best=0d9fc3f15008d97b1caba26c8dde8163850f20d1db0c4446140d9e4fd941e8ae height=386 version=0x20000000 log2_work=28.596212 tx=387 date='2019-01-01 22:34:53' progress=1.000000 cache=0.0MiB(326txo)
2019-01-01 22:34:58 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
2019-01-01 22:34:59 UpdateTip: new best=36c70adbf212df121a0a37e0e3cb3071459b4a50b989572145f7b62f19cbcdf9 height=387 version=0x20000000 log2_work=28.599935 tx=388 date='2019-01-01 22:34:58' progress=1.000000 cache=0.0MiB(327txo)
2019-01-01 22:35:01 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
2019-01-01 22:35:09 UpdateTip: new best=54358b011951aa4a1035dfad6490e568c655c97c6cfca35b726eb508617deff7 height=388 version=0x20000000 log2_work=28.603648 tx=389 date='2019-01-01 22:35:06' progress=1.000000 cache=0.0MiB(328txo)
2019-01-01 22:35:11 CreateNewBlock(): block weight: 772 txs: 0 fees: 0 sigops 400
What could be wrong?