If you are having problems with your wallet syncing or stuck please to the following:
Shut down the wallet program keep your wallet.dat safe someplace else.
Delete everything in the lux folder make sure you're using the newest wallet 4.2.0
Unzip this in the lux folder https://bootstrap.luxcore.io/bootstrap.zip
Start the wallet
Once fully synced stop the wallet and place your backup wallet.dat in the lux folder
Start the wallet again