Notification "Time is almost up!" on a corr. game resigned 45 hours ago

Well it's mostly what i wrote in the topic:
I've received a notification "Time is almost up!" right now, on a correspondence game i resigned 45 hours ago.
I may also open a github issue if wanted.
Kind regards

It seems you're not the only one with this issue:
lichess.org/qa/6287/i-received-notification-that-im-about-to-time-out-in-a-completed-game

Provide as much info as you can, and make sure you post the issue on the appropriate github page:
github.com/veloce/lichobile