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ProcessBlock: ORPHAN BLOCK 751, prev=aa1355d0445953ee6f4525080b3dab11a3cb941c77502ded6c7d8faae98fb4e7
I have to close wallet, delete generated log file (it is prety large) and start it again. It can continue in syncing again after that. But it stops on another random block again. So have to close and start it again for syncing another blocks until next stop ...
Running on i5-3470, 16GB, SSD, Win8.1, 1Gbps symmetric connection. Previous wallet was well working.