FedEx tracking goes dark on packages s lot for me. The original estimate for delivery will pass and no update on tracking for a week. Then maybe the item shows up. Maybe it doesn’t. I had a pair of Fjällräven trekking tights I ordered for my wife as a gift with no updates in tracking for a week after it departed the origin location. Then they showed up in a mangled package with tire marks, holes, and packing tape all over it.
Other times, packages will show up as received at the local facility a few days prior to delivery estimate and they’ll just sit there until a day or two after the deliver estimate before being put on the truck. A lot of this had been happening prior to 2020, too, so it’s not just the pandemic. It’s bad logistics.
UPS has exceeded expectations in that regard, as packages are usually delivered on time, or a day or two early. And tracking info is updated more frequently.