The Third Circuit emailed out the following notice late last night:

The electronic filing system (CM/ECF) will be undergoing maintenance beginning Saturday, February 15, 2020 at 12:00 AM to Tuesday, February 18, 2020 at 7:00 AM. Public filers will be unable to file documents during this time.

This should impact few if any filing deadlines since Monday is a federal holiday, see FRAP 26, but it is a longer-than-usual downtime, so be aware of it if you plan to file anything in the next few days.