Era customer service jingle: Hello, XCN wallet is not synchronized, and not the speed problem oh! Because the synchronization is expected after the block will be completed on schedule to 100% can not be completed [we are] many times synchronous stop card in schedule 99%, if closed open, there will be error: Assertion failed! Program:C:Users File: trieview.cpp.line Expression: blockCache.ReadBlockFromDisk..... 305 (blkck, PIndex) if you can please give us feedback, thank you. This is the answer BTC38 customer service.