It might be that this instance is having more and more users, and the server load is high? There is also this reproducible issue: https://monero.town/post/1135619
If the server upgrade is necessary, probably many users are willing to chip in. These issues may be magically gone after updating to v0.19, though: https://monero.town/post/1135619 since the new version appears to be “very fast according to some new posts”.
PS. Sometimes “Post” doesn’t work either, taking forever and not posted.