I had the same suspicion Tombar87 that the down state of some nexctlcoud.com servers are causing troubles for Nextcloud installations.
Timeouts and very slow connection between Apache reverse proxy and Nextcloud instance
I think this has happened before when the NC.com servers were heavily loaded after the release of a new version.
In despair I tried to reinstall NC but the installation gets timeouts when it wants to download files from nextcloud.com
This issue needs to be sorted out. Should I wait with the reinstallation?