Thanks ...
It's Bitcoin Core.
After 2 days of reloading blocks, still 36 weeks behind, I have a "fatal error" and the software shuts down.
Here is the last part of debug file:
2019-12-16T04:45:57Z ERROR: ConnectTip: ConnectBlock 00000000000000000023712d268712147475cc3ee028ca514e3f74799b20696e failed, bad-txnmrklroot, hashMerkleRoot mismatch (code 16)
2019-12-16T04:45:57Z Failed to connect best block (bad-txnmrklroot, hashMerkleRoot mismatch (code 16))
2019-12-16T04:45:57Z [default wallet] Submitting wtx 4302c64fab0f323fe845e0f0d290e2d9fb8ed1c649cb7979c0235987c60fde78 to mempool for relay
2019-12-16T04:45:57Z [default wallet] Submitting wtx 29803ea363c61975cace8800529c52c65f458aaa3b0ddc46c0037f5a0df8a0b9 to mempool for relay
2019-12-16T04:45:57Z GUI: Platform customization: "windows"
2019-12-16T04:45:58Z GUI: QObject::connect: Cannot queue arguments of type 'size_t'
(Make sure 'size_t' is registered using qRegisterMetaType().)
2019-12-16T04:45:58Z tor: Thread interrupt
2019-12-16T04:45:58Z Shutdown: In progress...
2019-12-16T04:45:58Z opencon thread exit
2019-12-16T04:45:58Z addcon thread exit
2019-12-16T04:45:58Z torcontrol thread exit
2019-12-16T04:45:58Z net thread exit
2019-12-16T04:45:58Z msghand thread exit
2019-12-16T04:45:58Z scheduler thread interrupt
2019-12-16T04:45:59Z [default wallet] Releasing wallet
2019-12-16T04:45:59Z Shutdown: done
What to do next?
Uninstall and re-install?
Thnx