[gshdg]

Ask them what's going on. In the current climate, they may be struggling with anxiety and depression. Or distracted by having their kids home all day; etc.

Be up-front about what you need from them and why. Be clear about what accommodations you do and do not have the ability to make.

If it turns out that they're dealing with something temporary, or if they can continue being worth employing in general, consider shifting the bottlenecked responsibilities to someone else.