UploadThing: Sporadic upload error for some users

One of our clients has a bunch of forms where UploadThing is used for file inputs. Some users of this website have in the last few weeks been experiencing errors uploading. One user I spoke to was able to upload from her workplace, but not from home, so might this be a network/firewall kind of related issue? She has been able to uplaod from home before without issues. I have not been able to reproduce the error myself, but the user I talked to have provided these screenshots. What can the issue be here?