The HERE needs definitely backup. I have country maps downloaded there for travel, and phone is always offline, but often I see white map for the downloaded are

The HERE needs definitely backup. I have country maps downloaded there for travel, and phone is always offline, but often I see white map for the downloaded area. Initially it is always white. Sometimes it helps if you get online for a moment, but even then later on I have still got white map. Similar issues with both Android and iOS versions. Unreliable stuff