On my Legacy Save (PS4) I’m finding my local portal will revert to its uncharged state if I leave it.
It can be recharged easily but requires all the materials all over again every time. Sometimes the portal is still ‘running’ on its previously dialed address, other times it’s dormant.
Not game-breaking but is a quite annoying.
During Atlas Rises, this save had the Portal Interface Bug where unattended portals would become inoperable. This may be a carry over from that bug.
Edit: reported to Zendesk.