Probably this would help;
What I did is backup my wallet.bat and delete everything then install new wallet. Do not copy your backup wallet.bat to the new installed wallet yet, wait until it completed sync then copy your wallet.bat to it. If it stuck during syncing just open and close wallet method. What I found if the wallet is out of syn then it will never be sync again. it see the block OK but can't download it, the connection and download keep kick it out.