Lisk (LSK) will undergo a network upgrade in the form of a hard fork on 21st of August, at 8:00 AM UTC.
We have no estimate of when funding will be reenabled at this time, but it'll likely be multiple days after the fork. We may extend the duration of the maintenance window based on conditions of the Lisk network before and after the fork. Once funding is reenabled, clients may need to generate a new deposit address. Kraken will continue to support trading of lisk throughout the upgrade period.
Further information can be found on the LISK announcement here.
Many hardware wallets will not be supporting this upgrade and it’s recommended that users withdraw their funds to a supporting wallet before the hard fork.
Below is the announcement by SatoshiLabs, the team behind Trezor Hardware wallet. Note that Kraken is not affiliated with SatoshiLabs.