what is the best and safest way to store my xvg coins for long term offline ? i see there is some trouble with the xvg wallet?
there's no trouble with the wallet, it just takes a while to sync 3 years of a blockchain. i would suggest using the core wallet for the platform you have,
and keeping your coins there. you can download the chain to make it sync faster, from vergecurrency.de or cryptochainer.com